Template:ElementalTypes The ??? type (Japanese: ???タイプ ??? type), unlike the Template:Type2, is an elemental type which existed as a non-glitch type from Generation II onward. However, no Pokémon bears this type. Pokémon eggs are typed solely with this before they hatch, and by extension, bad eggs are also of the ???-type.
Weaknesses and resistances
The ??? type has neither any weaknesses nor resistances.
No real Pokémon are ???-types; however, both eggs and bad eggs are labeled with this type until Generation IV, when type-displaying menus are absent for eggs. This still renders them typeless, and still of the ???-type, however; it simply does not say so due to the fact that the profiles for eggs are different to main Pokémon summaries.
Pokémon Mystery Dungeon moves
Vacuum-Cut will hit every Pokémon in the room, but only by 16, 17 or 18 points each time. Wide Slash will hit every Pokémon 3 tiles away either forwards, backwards or diagonally.
Curse behaves differently depending on the type of the Pokémon using it; more specifically, if the Pokémon is of the Template:Type2, it will cut their HP in half and place a curse on the target Pokémon, while for any other type it will merely lower the Pokémon's Speed to raise Attack and Defense.
There is no actual purpose in Curse being a ???-type move besides its mysterious nature. If hacked to be of any other type, the move will still work as normal.
Shadow moves are type-less moves, rendering their typing unknown.
In Pokémon Colosseum, Shadow Pokémon have the move Shadow Rush until they are purified. In Pokémon XD: Gale of Darkness, more Shadow moves are introduced. Starting in Pokémon XD: Gale of Darkness, these moves are super-effective against regular Pokémon and not very effective against other Shadow Pokémon. It should be noted that in Pokémon Colosseum, Shadow Rush, the only Shadow move, is marked as a ???-type attack. However, it is only in Pokémon XD: Gale of Darkness that these moves are not given a type at all.
These unknown typed moves do not run exclusively off of the user's Attack or Special Attack stat, instead depending on the move. This would later be extended to moves of the rest of the types in Generation IV.
In every other game, ???-type offensive moves, although none exist, can be hacked in. Because they're not programmed to be either Physical or Special, even with a base power of 255 (the highest that the game allows), the move will do almost no damage.
Arceus's Multitype ability allows it to change types based on which Plate it holds. Although there is no ???-type plate, the code for Pokémon Diamond, Pearl, and Platinum has a sprite for ???-type Arceus. It is possible that this sprite was included to prevent the game from crashing if its base type was changed to be ???-type instead of Template:Type2.