Types refer to different elemental properties associated with both Pokémon and their moves.
There are 18 total official types of Pokémon:, , , , , , , , , , , , , , , , , and . These 18 types apply to both Pokémon and their moves. Their is also the unofficial glitch types, ??? and Bird. Shadow type exists but only in the Colluseum games.
Each type has its own strengths and weaknesses, most of which are logical setups. Fire-type Pokémon are weak to Water-type Pokémon, Ice-type Pokémon are weak to Fire-type Pokémon, Water-type Pokémon are weak to Electric-type Pokémon, etc. These matchups also apply to the types of moves as well. A Fire-type move such as Ember will be strong against a Grass-type Pokémon such as Bulbasaur.
Pokémon themselves can have up to two types (making them dual-type Pokémon), but moves can only be one type. Most if not all dual-type Pokémon's types correspond with one another such as a Grass/Poison-type Pokémon such as Bulbasaur, or a Rock/Ground-type Pokémon such as Onix. However, not all dual-type Pokémon's types relate to each other like this. Some Pokémon may be dual-type between two types that don't normally go together such as Water/Electric-types (such as Lanturn) or grass/water types (such as Ludicolo) or Grass/Flying-types (such as Jumpluff), or Fighting/Psychic (such as Medicham). Some duel type Pokemon lose one of their types and gain a different type upon Evolution such as Scyther (a Bug/Flying type) which evolves into Scizor (a Bug/Steel type). Some singular type Pokemon will change completely to a different type or types upon evolution such as Azurill (a Normal Type) which evolves into Marill (a Water/Fairy Type) or Eevee (a Normal Type) which can evolve into Flareon (a Fire Type), Jolteon (an Electric Type), Vaporeon (a Water Type), Espeon (a Psychic Type), Umbreon (a Dark Type), Glaceon (an Ice Type), Leafeon (a Grass Type) or Sylveon (a Fairy Type).
- Both Generation II and VI added to the list of types, Gen II adding
and and Gen VI adding .
- Due to this Magnemite, Magneton, Marill, Jigglypuff, and Gardevoir are the only Pokemon to officially have their types change. Magnemite and Magneton gained the Steel attribute and Marill, Jigglypuff, and Gardevoir gained the Fairy attribute.