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Mew glitch

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A wild Mew being found using the Mew glitch

The Mew glitch (or Trainer-Fly glitch) is a software bug found in all four of the Generation I Pokémon Game Boy games. It was first reported in 2003[1], but was used previously by many who knew it. This glitch is famous for allowing players to catch any non-glitched Pokémon in the game, most notably Mew. Method #3 of the Mew glitch allows one to catch both glitch Pokémon and regular Pokémon.

Methods

Method #1

To get Mew at the earliest point possible in the game, the player must not have defeated the Swimmer in Cerulean Gym and the Jr. Trainer (the one who says "I saw your feat from the grass" when the battle with him begins) on Route 24 in the grass. The player must defeat the Trainers on Nugget Bridge as usual.

The player must have an Abra that can Teleport in their party, and therefore, if playing Pokémon Yellow, must have reached Route 5 to catch one or traded for one beforehand.

The player must first heal at the Cerulean City Pokémon Center, so they may Teleport there later. With an Abra in their party, the player then needs to stand north of the Jr. Trainer so that he is just below the screen. It is recommended that the player now saves the game. The player must move down until seen and immediately press the "START" button. The player then needs to Teleport with Abra. If done correctly, the Jr. Trainer should get the indicative exclamation mark above his head immediately before the player Teleports. At this point, the menu will not work until after the player enters a battle, though it is imperative to not battle.

The player then needs to head east from the Pokémon Center into the Cerulean Gym and battle the Swimmer. After defeating the Swimmer (the menu should be available upon victory), the player then must head to Route 24, and after several steps the menu will appear. Upon closing of the menu, a battle will begin with a wild Mew at Level 7.

By Wooggle
Videos are currently unavailable on Bulbapedia; instead, you can watch the video on YouTube here.

Method #2

The player must follow the steps for Method #1 exactly until after teleporting from the Jr. Trainer. The player then must head north to Route 25 and battle the Youngster. As in Method #1, it is imperative to avoid all other battles before then. The player must engage in battle by being seen (and must walk along the wall to be seen, not towards him, otherwise the game will freeze).

After defeating the Youngster, the player then needs to walk towards Cerulean City. After a certain amount of steps the Start menu will appear. Closing it should begin a battle against a wild Mew at Level 7.

By Wooggle
Videos are currently unavailable on Bulbapedia; instead, you can watch the video on YouTube here.

Method #3

For this method, the player needs to find any Trainer in the game that will engage in battle the moment the Trainer is on screen and the player is in the Trainer's line of sight. The player then needs to take one step down closer to the NPC, but make sure that the NPC does not see the player, and then immediately press the "START" button. The menu will appear and the player will be able to Fly or Teleport. The player needs to fly or teleport to Cerulean City. While flying, the exclamation point that usually appears above a Trainer's head when they challenge the player to battle will appear. The player then needs to go to Route 24 and defeat the Youngster that owns a Slowpoke (and must walk along the wall to be seen, not towards him or the game will freeze). After defeating him, the player needs to fly or teleport to Lavender Town and head to Route 8. The menu will appear. Pressing B will make a wild Mew appear at Level 7.

Ditto glitch

This method is also known as "Method #4".

For this method, the player first needs a Pokémon with a Special stat of 21. It doesn't matter if the stat was naturally leveled or boosted with stat experience, as long as it's not due to an in-battle Special-stat boosting skill. The player needs to find any Trainer in the game that will engage in battle the moment the Trainer is on screen and the player is in the Trainer's line of sight. The player then needs to take one step down closer to the Trainer, but make sure that the Trainer does not see the player, and then immediately press the "START" button. Once the player has pressed Start and the menu appears, the player needs to Fly or Teleport elsewhere. The location being traveled to must have a path via which the player can walk both to a place where there are wild Ditto (Route 15RB or Pokémon MansionY) and a Trainer to fight. This is because the Start button will no longer work until after a battle with a Trainer (to be mentioned) because the game has been tricked into thinking it's in battle mode. Once the battle with the Trainer the player picked (the first Trainer) was evaded successfully with Fly or Teleport, the player then needs to battle any Trainer in the new location; there needs to be one space between the player and the second Trainer when the battle is initiated so that the second Trainer has to walk up to the player. After defeating the Trainer, the player needs to encounter a wild Ditto, and battle it until it uses Transform on the player's Pokémon with the Special Stat of 21. After defeating the Ditto (with any of the player's Pokémon), the player must not battle, and go back to the location where the first Trainer the player first evaded is located. Once the location is approached, the menu will automatically appear. The player must press the B button. A battle will begin with a wild Mew.

This method can be used to catch any Pokémon in the game, even some glitch Pokémon. While a Pokémon with a special stat of 21 will give one Mew, using a Pokémon with a different special stat will give the player a different Pokémon. For example, in the Red/Blue versions, if a Pokémon with a Special stat of 198 is used, ゥL ゥM 4 will appear instead of Mew. Some Special stats will cause glitch Trainers to appear.

Glitch Pokémon

Many different regular and glitch Pokémon, as well as glitch Trainers, can be encountered with the Ditto glitch. While Special stats cannot go below 5, special stats above 255 are reduced to modulo 256. Here is a table showing which special stat corresponds to which Pokémon. Glitch Trainers are in bold.

Pokémon Special stat
Rhydon 1
Kangaskhan 2
Nidoran♂ 3
Clefairy 4
Spearow 5
Voltorb 6
Nidoking 7
Slowbro 8
Ivysaur 9
Exeggutor 10
Lickitung 11
Exeggcute 12
Grimer 13
Gengar 14
Nidoran♀ 15
Nidoqueen 16
Cubone 17
Rhyhorn 18
Lapras 19
Arcanine 20
Mew 21
Gyarados 22
Shellder 23
Tentacool 24
Gastly 25
Scyther 26
Staryu 27
Blastoise 28
Pinsir 29
Tangela 30
Missingno. 31
Missingno. 32
Growlithe 33
Onix 34
Fearow 35
Pidgey 36
Slowpoke 37
Kadabra 38
Graveler 39
Chansey 40
Machoke 41
Mr. Mime 42
Hitmonlee 43
Hitmonchan 44
Arbok 45
Parasect 46
Psyduck 47
Drowzee 48
Golem 49
Missingno. 50
Magmar 51
Missingno. 52
Electabuzz 53
Magneton 54
Koffing 55
Missingno. 56
Mankey 57
Seel 58
Diglett 59
Tauros 60
Missingno. 61
Missingno. 62
Missingno. 63
Farfetch'd 64
Venonat 65
Dragonite 66
Missingno. 67
Missingno. 68
Missingno. 69
Doduo 70
Poliwag 71
Jynx 72
Moltres 73
Articuno 74
Zapdos 75
Ditto 76
Meowth 77
Krabby 78
Missingno. 79
Missingno. 80
Missingno. 81
Vulpix 82
Ninetales 83
Pikachu 84
Raichu 85
Missingno. 86
Missingno. 87
Dratini 88
Dragonair 89
Kabuto 90
Kabutops 91
Horsea 92
Seadra 93
Missingno. 94
Missingno. 95
Sandshrew 96
Sandslash 97
Omanyte 98
Omastar 99
Jigglypuff 100
Wigglytuff 101
Eevee 102
Flareon 103
Jolteon 104
Vaporeon 105
Machop 106
Zubat 107
Ekans 108
Paras 109
Poliwhirl 110
Poliwrath 111
Weedle 112
Kakuna 113
Beedrill 114
Missingno. 115
Dodrio 116
Primeape 117
Dugtrio 118
Venomoth 119
Dewgong 120
Missingno. 121
Missingno. 122
Caterpie 123
Metapod 124
Butterfree 125
Machamp 126
Missingno. 127
Golduck 128
Hypno 129
Golbat 130
Mewtwo 131
Snorlax 132
Magikarp 133
Missingno. 134
Missingno. 135
Muk 136
Missingno. 137
Kingler 138
Cloyster 139
Missingno. 140
Electrode 141
Clefable 142
Weezing 143
Persian 144
Marowak 145
Missingno. 146
Haunter 147
Abra 148
Alakazam 149
Pidgeotto 150
Pidgeot 151
Starmie 152
Bulbasaur 153
Venusaur 154
Tentacruel 155
Missingno. 156
Goldeen 157
Seaking 158
Missingno. 159
Missingno. 160
Missingno. 161
Missingno. 162
Ponyta 163
Rapidash 164
Rattata 165
Raticate 166
Nidorino 167
Nidorina 168
Geodude 169
Porygon 170
Aerodactyl 171
Missingno. 172
Magnemite 173
Missingno. 174
Missingno. 175
Charmander 176
Squirtle 177
Charmeleon 178
Wartortle 179
Charizard 180
Missingno. 181
Missingno. (Kabutops Fossil form) 182
Missingno. (Aerodactyl Fossil form) 183
Missingno. (Ghost form) 184
Oddish 185
Gloom 186
Vileplume 187
Bellsprout 188
Weepinbell 189
Victreebel 190
▶ ARB/4 4Y 191
aRB/4 4HyY 192
ゥ (C1)RB/♀ .Y 193
ゥ .4RB/p PKMNp’ ’Y 194
h POKéRB/ゥ ( Z4Y 195
PokéWTrainerRB/X ゥ- xゥ,Y 196
PKMN (C5)RB/4. .Y 197
ゥL ゥM 4RB/7gY 198
♀Pゥ ゥゥTRB/uY 199
Jacred 200
Youngster 201
Bug Catcher 202
Lass 203
Sailor 204
Jr. Trainer♂ 205
Jr. Trainer♀ 206
PokéManiac 207
Super Nerd 208
Hiker 209
Biker 210
Burglar 211
Engineer 212
Juggler 213
Fisherman 214
Swimmer 215
Cue Ball 216
Gambler 217
Beauty 218
Psychic 219
Rocker 220
Juggler 221
Tamer 222
Bird Keeper 223
Blackbelt 224
Blue 225
Prof. Oak 226
Chief 227
Scientist 228
Giovanni 229
Rocket 230
CoolTrainer♂ 231
CoolTrainer♀ 232
Bruno 233
Brock 234
Misty 235
Lt. Surge 236
Erika 237
Koga 238
Blaine 239
Sabrina 240
Gentleman 241
Blue 242
Blue 243
Lorelei 244
Channeler 245
Agatha 246
Lance 247

Level

A Pokémon encountered using the Mew glitch is most commonly level 7. This is because as one Pokémon's Special Stat corresponds to the index number of the Pokémon, the Pokémon's level also corresponds to the attack stage of the last encountered Pokémon. The attack stage is the variable which is changed when a stat-modifying move like Growl is used. 7 is the unchanged value, but will range from 1 to 13 depending on how many attack boosts or drops the opponent received. For example, if the player used Growl on the Pokémon six times, he or she could encounter a level 1 Pokémon. However, Pokémon with levels 14 to 255 and 0 cannot be found this way, because a Pokémon cannot have more than six attack boosts or drops.[2]

If the Ditto glitch is used and a glitch Trainer is encountered, the Trainer class will use a different team corresponding to the attack stage. Usually the game will attempt to load the 7th party in memory. Some classes only have one to three set parties. This causes glitchy parties to appear if an attack-modifying move is not used to lower the attack stage to at least 3.

Text box variations

If the player causes a text box to pop up — for example, by talking to a NPC or reading a sign — before they return to the route where they flew, teleported, or dug away from the Trainer, something other than the start menu will pop up. This is typically dialogue from Trainers on the route, which may be followed by a wild Pokémon battle, after which the player will no longer be able to move. Alternately, the text may be from interacting with a sign or an item; in the latter case, the item will appear in the player's inventory and disappear from the route as if they had picked it up normally. This may also allow the player to obtain items which are not currently on the route. Finally, instead of a text box, the player may trigger other glitches, such as glitch songs or 0 ERROR.

Overview

The glitch in fact works as follows: Any Trainer can be used for the first section, as long as the Trainer notices the player as soon as he/she enters the game screen, and that the player is walking towards them from either the top, left or right (walking from below will not work). Teleport and Fly (or Escape Rope and Dig if in a dungeon) can be used to trigger the glitch. For the Youngster, any Trainer will do as long as they can be fought without walking up to them. To finish off the glitch, the player must return to the route of the Trainer evaded. The Pokémon that the player will find wild is dependent on the Special stat of the Pokémon the player last faced (wild or from the Trainer), and so using a Pokémon with the Special stat the player needs and finding a Ditto that transforms will produce an identical effect. The required Special stat for Mew is 21.

External links

References

  1. Nation Master - Encyclopedia: Mew glitch
  2. Glitch City Laboratories' page about the Ditto glitch


Main
Multiple
generations
:
Cloning glitchesGlitch PokémonGlitch types
Generation I: --0 ERRORCut glitchCable Club escape glitchDokokashira door glitch
Error codesExperience underflow glitchGlitch CityGlitch dimension
Glitch movesGlitch TrainersItem duplication glitchJohto guard glitch
Mew glitchOld man glitchPewter Gym skip glitchPokémon merge glitch
Second type glitchRhydon glitchSuper GlitchZZAZZ glitch
Generation II: Celebi Egg glitchCoin Case glitchesError codesExperience underflow glitchGlitch Egg
Johto guard glitchSketch glitchTeru-samaTrainer House glitchGlitch dimension
Generation III: Berry glitchDive glitchPomeg glitch
Generation IV: Acid rainGlobal Terminal glitchesMimic glitch
Pomeg glitchRage glitchSurf glitchTweaking
Generation V: Sky Drop glitchFrozen Zoroark glitch
Generation VI: Lumiose City save glitch
Glitch effects: Game freezeGlitch battleGlitch song
Gens I/II only: Japanese text in English games
Gen I only: Glitch screenTMTRAINER effect
Gen II only: Glitch dimension
Lists: Glitch movesGlitch types
Glitch Pokémon (Gen IGen IIGen IIIGen IVGen VGen VI)
Glitches (Gen IGen IIGen IIIGen IVGen VGen VISpin-off)

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