Types have been the main basis of the battle aspect of Pokémon since the very beginning. With 17 different types with dozens of Pokémon in each type with dozens of attacks of each type. All Pokémon have set types but this is not always the case. While Castform, Arceus, Shaymin, Rotom, Darmanitan & Meloetta have different types based on forms, there are other ways to change the type of the Pokémon.
There are various moves and abilities which can remove immunities based upon the Pokémon's type combinations and some which boost stats, but there are a handful of attacks and abilities which can alter the Pokémon's type. To top that off, Black & White have introduced a means in order to change your opponent's type to a specific type.
The move Soak is a relatively simple move. With it, you can take your opponent and submerse them in water, thus making them a pure Water-type, removing all of their type combinations and immunities. It also removes any Same-Type-Attack-Bonus they would have received from the moves in their moveset. This will allow you to fully hit in with Grass & Electric-type moves to damage the opponent.
Camouflage was originally a Staryu only move, but has since been learned by various other Pokémon. Camouflage will change the type of the user to a type depending upon the terrain in which it battles. In-game, this is highly useful. However, in the WiFi Rooms, it is rather limited as it will always be within a building. The places and types are as follows
Conversion is a move introduced within the first generation and thus the first move which actually changed the type of the Pokémon. Conversion changes the user's type to the type of one of its four moves. This will allow you to get the Same-Type-Attack-Bonus from these moves. However, as you don't have control over it, it will be completely random.
Conversion2 is a move which was introduced in the second generation to randomly change the type of the user. Unlike the above move, the type the user becomes varies. The user will become a type resistant to the type of the move that hit it so if it got hit by an Electric-type move, it may become a Ground-type. However, it can't make the user the same type as it already is, so if that would occur, the move will fail. Click here to consult with our Type Chart
Reflect Type is a move introduced within Generation V which allows for the user to take the complete type of the target Pokémon. This includes both types so can turn Mew from a Psychic Pokémon to a Dragon/Fire if it's against Reshiram or basically any type it is battling against. This can also be done Double & Triple Battles, by targetting your allies instead of your opponent, that way your Pokémon shall receive their type.
Color Change is a simple ability known only by Kecleon. This ability will change Kecleon's type to the type of the move that previously hit it. This gives Kecleon a tactical advantage against Pokémon who use single type moves. In Generations III & IV, this ability changed Kecleon's type with each hit on multi-hit moves, but with Black & White, this was removed and Kecleon only changes type after the final hit has occured.
Arceus' Multitype ability allows for it to change its type based upon its hold item. Throughout the games, you will find 17 different kind of plates. Attach these plates to Arceus and its type will change to the respective type for however long it holds onto this item.
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