Trainers are a new addition to the Pokemon Trading Card Game, which launched in Japan on February 1st, 2017.
Trainers give you access to the pokemon trading card game, and can be trained with cards.
They can also be used in some of the more popular games such as Pokemon Puzzle League, Pokémon Snap, and Pokémon Battle Revolution.
Trainers are also featured in Pokémon Black and White and the upcoming Pokémon Omega Ruby and Alpha Sapphire, which are due out in Japan next year.
In addition, trainers are also available in Pokémon Mystery Dungeon, and have appeared in the popular spin-off, Pokémon XD: Gale of Darkness.