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[[File:Bad egg.png|150px|thumb|A Bad Egg in the [[party]] in Generation III]]
[[File:Bad egg.png|150px|thumb|A Bad Egg in the [[party]] in Generation III]]
A '''Bad Egg''' (Japanese: '''ダメタマゴ''' ''Bad Egg''), stylized as '''Bad EGG''' in Generation III, is a phenomenon present in the [[Generation III]] through [[Generation VI]] Pokémon games that results from a corruption of Pokémon data so that the {{wp|checksum}} does not match up with the data's calculations. In [[Generation IV]], sometimes Bad Eggs can hatch into <!--the previous Pokémon,-->[[-----]] or another Bad Egg.
A '''Bad Egg''' (Japanese: '''ダメタマゴ''' ''Bad Egg''), stylized as '''Bad EGG''' in Generation III, is a phenomenon present in the [[Generation III]] to [[Generation VI]] Pokémon games that results from a corruption of Pokémon data so that the {{wp|checksum}} does not match up with the data's calculations. In [[Generation IV]], sometimes Bad Eggs can hatch into <!--the previous Pokémon,-->[[-----]] or another Bad Egg.


Bad Eggs are not really [[Pokémon Egg]]s, and may possibly never have been, but instead the default message returned by the game if the checksum is wrong (which happens only if data is altered badly). Bad Eggs rarely hatch and cannot be released, merely taking up space, though there are methods of removing them—it is possible to [[trade]] a Bad Egg away into another game, or remove it by [[cheating]].
Bad Eggs are not really [[Pokémon Egg]]s, and may possibly never have been, but instead the default message returned by the game if the checksum is wrong (which happens only if data is altered badly). Bad Eggs rarely hatch and cannot be released, merely taking up space, though there are methods of removing them—it is possible to [[trade]] a Bad Egg away into another game, or remove it by [[cheating]].
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==Game data==
==Game data==
[[File:Bad Egg status screen RS.png|frame|The Bad Egg's status screen in {{game|Ruby and Sapphire|s}}]]
[[File:Bad Egg status screen RS.png|frame|The Bad Egg's status screen in {{game|Ruby and Sapphire|s}}]]
In Generation III, Bad Eggs appear with a type of {{t|???}} like a normal Egg, as well as have the same Pokémon status screen as an Egg would. Despite this, the similarities end there, as Bad Eggs can be [[held item|holding items]] (such as {{DL|Poké Ball|Cherish Ball}}s, which cannot be taken), be placed within types of [[Poké Ball]]s aside from the standard kind, and have [[Seal]]s attached—which prevents them from being deposited in the PC. After that, it is only possible to remove the seal from the Bad Egg by depositing it into the [[Pokémon Day Care]].
In Generation III, Bad Eggs appear with a type of {{t|???}} like a normal Egg, as well as have the same Pokémon status screen as an Egg would. Despite this, the similarities end there, as Bad Eggs can be [[held item|holding items]] (such as [[Cherish Ball]]s, which cannot be taken), be placed within types of [[Poké Ball]]s aside from the standard kind, and have [[Seal]]s attached—which prevents them from being deposited in the PC. After that, it is only possible to remove the seal from the Bad Egg by depositing it into the [[Pokémon Day Care]].
Some may be reported to have [[Pokérus]] or be cured of it, and may be [[fainting|fainted]].
Some may be reported to have [[Pokérus]] or be cured of it, and may be [[fainting|fainted]].
[[File:900MS.png|left]]
[[File:900MS.png|left]]
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{{Availability/Gen|gen=III}}
{{Availability/Gen|gen=III}}
{{Availability/Entry2|v=Ruby|v2=Sapphire|t=fff|t2=fff|area=[[Cheating]]}}
{{Availability/Entry2|v=Ruby|v2=Sapphire|t=fff|t2=fff|area=[[Cheating]]}}
{{Availability/Entry1|v=Emerald|area=[[Glitzer Popping]] (failed corruption)}}
{{Availability/Entry1|v=Emerald|area=[[Cheating]], [[Glitzer Popping]] (failed corruption)}}
{{Availability/Entry2|v=FireRed|v2=LeafGreen|area=[[Cheating]]}}
{{Availability/Entry2|v=FireRed|v2=LeafGreen|area=[[Cheating]]}}
{{Availability/Entry1/None|v=Colosseum|area=Not available}}
{{Availability/Entry1/None|v=Colosseum|area=Not available}}
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[[File:Bad Egg status screen E.png|frame|The Bad Egg's status screen in {{game|Emerald}}]]
[[File:Bad Egg status screen E.png|frame|The Bad Egg's status screen in {{game|Emerald}}]]
===Generation III===
===Generation III===
When using the [[GameShark]] code for quick {{pkmn|Day Care}} level-up, an invisible Bad Egg will appear in the party, which can be switched around using the PC and used in battle. Sometimes, the Bad Egg will take form of the silhouette of a Pokémon in the PC Box. However, attempting to view its summary screen will cause a [[game freeze]].
When using the [[GameShark]] code for quick {{pkmn|Day Care}} level-up, an invisible Bad Egg will appear in the party, which can be switched around using the PC and used in battle. Sometimes, the Bad Egg will take form of the silhouette of a Pokémon in the PC Box. However, attempting to view its summary screen will cause a [[game freeze]], as shown in the video below.


Alternatively, by using codes to capture wild Pokémon instantly, reducing their HP to 0 yet keeping the battle going, it will be sent to the PC instead as a Bad Egg. This Bad Egg can be removed from the game by picking up another Pokémon while it is held, then setting it back down. This Bad Egg appears differently; instead of an Egg in its status box, it is the "unseen Pokémon" image used in the Pokédex and by [[ten question marks|??????????]]. Like ??????????, using it in battle will cause an instant whiteout (if used without any other Pokémon in the party).
{{YouTubeVid|ztJsn2MfT40|channel/TheICTLiker4|name=TheICTLiker4|???}}
 
Alternatively, by using codes to capture wild Pokémon instantly, reducing their HP to 0 yet keeping the battle going, it will be sent to the PC instead as a Bad Egg. This Bad Egg can be removed from the game by picking up another Pokémon while it is held, then setting it back down. This Bad Egg appears differently; instead of an Egg in its status box, it is the “unseen Pokémon” image used in the Pokédex and by [[ten question marks|??????????]]. Like ??????????, using it in battle will cause an instant whiteout (if used without any other Pokémon in the party).


Bad Eggs can also occur if the player attempts to hack a Pokémon which has an illegal moveset, as the checksums will not add up correctly (as the checksum would use the Pokémon's normal moveset at that level as a check).
Bad Eggs can also occur if the player attempts to hack a Pokémon which has an illegal moveset, as the checksums will not add up correctly (as the checksum would use the Pokémon's normal moveset at that level as a check).


In Emerald, when warp cheat codes are used to steal from the {{gdis|Battle Factory|III}}, an invisible Bad Egg appears in the 19th slot of the 1st box in the [[Pokémon Storage System|PC Storage]]. If a Pokémon is in that slot, it corrupts the Pokémon and merges into a proper Bad Egg.
In Emerald, when warp cheat codes are used to steal from the {{gdis|Battle Factory|III}}, an invisible Bad Egg appears in the 19th slot of the 1st box in the [[Pokémon Storage System|PC Storage]]. If a Pokémon is in that slot, it corrupts the Pokémon and merges into a proper Bad Egg.
The embedded below shows that opening Bad EGG's summary always causes the game to freeze.
{{YouTubeEmbed|ztJsn2MfT40|channel/TheICTLiker4|name=TheICTLiker4|???}}


===Generation IV===
===Generation IV===

Revision as of 16:21, 20 June 2019

A Bad Egg in the party in Generation III

A Bad Egg (Japanese: ダメタマゴ Bad Egg), stylized as Bad EGG in Generation III, is a phenomenon present in the Generation III to Generation VI Pokémon games that results from a corruption of Pokémon data so that the checksum does not match up with the data's calculations. In Generation IV, sometimes Bad Eggs can hatch into ----- or another Bad Egg.

Bad Eggs are not really Pokémon Eggs, and may possibly never have been, but instead the default message returned by the game if the checksum is wrong (which happens only if data is altered badly). Bad Eggs rarely hatch and cannot be released, merely taking up space, though there are methods of removing them—it is possible to trade a Bad Egg away into another game, or remove it by cheating.

Game data

The Bad Egg's status screen in Pokémon Ruby and Sapphire

In Generation III, Bad Eggs appear with a type of ??? like a normal Egg, as well as have the same Pokémon status screen as an Egg would. Despite this, the similarities end there, as Bad Eggs can be holding items (such as Cherish Balls, which cannot be taken), be placed within types of Poké Balls aside from the standard kind, and have Seals attached—which prevents them from being deposited in the PC. After that, it is only possible to remove the seal from the Bad Egg by depositing it into the Pokémon Day Care. Some may be reported to have Pokérus or be cured of it, and may be fainted.

900MS.png

A Bad Egg placed in the first slot of the party will, rather than having a normal Egg menu sprite, have a differently colored version of the menu sprite of the Pokémon following it, such as a golden Bulbasaur, a blue Marowak, or a brown Ho-Oh. It is unknown exactly why the sprite retains the last Pokémon's sprite, but the color change is because of the use of palette 0 for this sprite—this is why Pokémon with palette 0 do not change color.

Being an Egg, it cannot be released.

If it is forced to hatch through use of a cheat code, a ? will come out and the game will immediately freeze.

From Generation IV onwards, a Bad Egg will be listed as being received on January 0, 2000, with the place received listed as the Mystery Zone.

Bad Eggs re-appear in Generation VI, not to be confused with 'mystery Eggs'.

Game locations

Generation III
Ruby Sapphire
Cheating
Emerald
Cheating, Glitzer Popping (failed corruption)
FireRed LeafGreen
Cheating
Colosseum
Not available
XD
Not available
Generation IV
Diamond Pearl
Cheating
Platinum
Cheating
HeartGold SoulSilver
Cheating
Generation V
Black White
Cheating
Black 2 White 2
Cheating
Generation VI
X Y
Cheating
Omega Ruby Alpha Sapphire
Cheating


Evolution

Egg.png
Does not evolve
Bad Egg
 ??? 



Appearances of Bad Eggs

The Bad Egg's status screen in Pokémon Emerald

Generation III

When using the GameShark code for quick Day Care level-up, an invisible Bad Egg will appear in the party, which can be switched around using the PC and used in battle. Sometimes, the Bad Egg will take form of the silhouette of a Pokémon in the PC Box. However, attempting to view its summary screen will cause a game freeze, as shown in the video below.

By TheICTLiker4
This video is not available on Bulbapedia; instead, you can watch the video on YouTube here.


Alternatively, by using codes to capture wild Pokémon instantly, reducing their HP to 0 yet keeping the battle going, it will be sent to the PC instead as a Bad Egg. This Bad Egg can be removed from the game by picking up another Pokémon while it is held, then setting it back down. This Bad Egg appears differently; instead of an Egg in its status box, it is the “unseen Pokémon” image used in the Pokédex and by ??????????. Like ??????????, using it in battle will cause an instant whiteout (if used without any other Pokémon in the party).

Bad Eggs can also occur if the player attempts to hack a Pokémon which has an illegal moveset, as the checksums will not add up correctly (as the checksum would use the Pokémon's normal moveset at that level as a check).

In Emerald, when warp cheat codes are used to steal from the Battle Factory, an invisible Bad Egg appears in the 19th slot of the 1st box in the PC Storage. If a Pokémon is in that slot, it corrupts the Pokémon and merges into a proper Bad Egg.

Generation IV

Index number 495

The Bad Egg's status screen in Pokémon Diamond, Pearl, and Platinum

In addition to forcing an ordinary Pokémon to have an invalid checksum, it is possible to encounter a Bad Egg in the wild by using an Action Replay on Pokémon Diamond, Pearl, and Platinum and setting the wild Pokémon modifier code to 495 (an identifier of Manaphy Egg, although a Manaphy Egg is rendered as a Bad Egg in battle). The game will freeze instantly on capture when the game attempts to show the Pokédex entry, though some emulator versions allow it. A normal Egg captured this way (using an identifier of 494) will hatch into a random Pokémon, including Pokémon that do not normally hatch from Eggs like legendary Pokémon and evolved Pokémon, or may hatch into ----- or, like its Generation II counterpart, another Egg (which will then go on to hatch into a ----- itself). Due to being incorrectly generated, whatever is hatched may eventually turn into a Bad Egg itself, and then subsequently hatch yet again. The use of an Action Replay with a "1 hit kill" cheat in Double Battles will often result in a Bad Egg appearing. If the player sees a Bad Egg, the game will occasionally freeze. If Transform is used against a Bad Egg, its back sprite will be exactly the same as its front sprite and the only move it knows is Splash.

An Action Replay code can give the player a Bad Egg that is infected with the Pokérus, which will eventually hatch into a Shiny Rotom that is in Fan form.

From catching other Trainers' Pokémon via cheat

If the cheat to catch other Trainers' Pokémon is used, often the Pokémon caught, if following moving after another Pokémon, will either be named the same as the previous Pokémon, Bad Egg, or have a blank name. There are no other side effects.

Hacked data in Pokémon Battle Revolution

In Pokémon Battle Revolution, some Pokémon that are hacked may become Bad Eggs when they are copied from Diamond, Pearl, Platinum, HeartGold, and SoulSilver. A common example of a Bad Egg replacing a Pokémon is when that Pokémon has more than 510 effort values. Bad Eggs are unable to battle in Pokémon Battle Revolution.

If the player has a hacked Pokémon, although it won't appear to be a Bad Egg on a DS game, it will show up as a Bad Egg on Pokémon Battle Revolution if used in a DS battle.

Generation V

Generation V Action Replay code

In Generation V, if a wild Pokémon modifier code is used to encounter a Pokémon with a National Pokédex number greater than 649, a Bad Egg may appear as a result. The Egg will flee from battle. Catching the Egg will result in the message for a successfully caught Pokémon, but the data of the Egg will be deleted after the battle. The Egg does not have a Pokédex entry or any status information. The player's Pokémon will not earn any experience after the battle. Due to the removal of Seals as a game mechanic, Generation V Bad Eggs cannot have Seals.

Generation VI

BoEANSprite.png This glitch is in need of research.
Reason: Are the Bad Eggs accessible as their own species like in Generation IV, and/or through corrupted Pokémon data?
You can discuss this on the talk page.

Bad Eggs re-appear in Pokémon X and Y.[1]

In other languages

050Diglett.png This section is incomplete.
Please feel free to edit this section to add missing information and complete it.
Reason: Names in Generation VI
Language Title
France Flag.png French Mauv. Œuf*
Mauv. Oeuf*
Mauv. OEUF*
Germany Flag.png German Schl. Ei*
Schl. EI*
Italy Flag.png Italian Uovo peste*
UOVO peste*
South Korea Flag.png Korean 불량알 Bullyang-al
Spain Flag.png Spanish Huevo malo*
HUEVO malo*

References

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ゥ 'M p'u ゥAゥ GPゥ ゥ ゥ4 hGlitch (D7)PkMnaPkMnゥ ♂ fPkMnk
PkMnRPkMn "B (DA)Glitch (DB)Glitch (DC)7PkMn 'v-PkMn.PkMn
/PkMn ▼PkMn'v……ゥ (E3)Glitch (E4)C- -
Pゥ 4$X CcA (EA)Glitch (EB)Glitch (EC)hゥ
.gゥ$'Mゥ$ (F0)94ゥ l (F2)ゥ l (F3)ゥ$ (F4)
ゥ (F5)G'Mp'Ng'Mp'Ng ゥ$94 hGlitch (FA)'M 'N gO
ゥ$ 6ゥ'M (FE)'M (FF)
Yellow: 3TrainerPoké $MissingNo.4 44 4 Hy♀ .pPkMnp' 'ゥ ( Z4
X ゥ- xゥ,4. .ァ7gug gァ / g J 1Glitch (CA)
. pゥ.8ゥ. BPkMn pゥぁ ゥぇ (CE)4, ゥァ (CF)ゥ'B ァ h
PkMn ? Aゥゥ)ゥ (D4)'ゥ.PkMn pゥぁ ゥぇ (D6)B (D7)PkMn (D8)
ゥ (D9)]ゥ' BPkMn (DC)4, ゥァ (DD)8 (DE)p ID
8 P ァ'r 'r 4(h4to894 89 48B 4 8Z ゥ9
ゥHIゥ.4(h4hi?$4HI?'r ゥ$ Pゥ. 4(?/4(h4?
ゥ► ゥ▼ ゥh 4Pゥ ゥ.... ゥ ( .I' .' B' ゥゥ ゥェ ゥ ▷ゥ $ A (F3)♂ p ゥ
▼ pゥゥ $ A (F6)PkMn (F7)ゥ 4- 4$ゥ▾ ゥ♂F q ,
ゥ$ 4MN ゥ× 'rゥ. 4-ゥ/ 4ァ 4,Q ◣
Generation II: ????? (00GSFCGSFEGSFFGS00CFCCFECFFC)
Glitch EggGlitch Unown
Generation III: -???????????Bad Egg
Generation IV: -----Bad EggGeneration IV hybrid
Generation V: -----Bad EggGlitch Unown
Generation VI: Bad EggGeneration VI 724+ glitch Pokémon


Project GlitchDex logo.png This glitch Pokémon article is part of Project GlitchDex, a Bulbapedia project that aims to write comprehensive articles on glitches in the Pokémon games.