Pokémon Adventure (not to be confused with Pokemon Adventures, the manga series) is a bootleg of a another bootleg, Sonic Adventure 7.
Gameplay[]
Pokémon Adventure is a 2D-platformer where you play as Pikachu (at least I think its Pikachu). Since this is a bootleg, of a Sonic bootleg Pikachu can do things like spin dash and roll into a ball. Due to the games poor programming, it's very difficult to play.
Pokémon[]
Most of the enemies are ripped from other games, such as Mario or Sonic, so there's very few actual Pokémon (unless you count Koopa Troopas as Pokémon).