The Pokemon franchise is based around hundreds of imaginary creatures that all have a certain type. Whether it be Pikachu's electric type or the water, fire, and grass types that make up the starters of every mainline Pokemon game, each Pokemon has its type, which makes it more effective against some enemies in battle, and less effective against others. Water beats fire, for example; grass beats water and so on. This simple gameplay mechanic has kept fans swapping out their Pokemon for more favorable type matchups for over twenty-five years.