The best Pokémon ever is Mewtwo XY. Ash’s best Pokémon is Grenja .There are many Pokémon in the world .There are games like POKEMON GO. Pikachu is the 2nd best Pokémon that Ash has.
Greninja is a water type Pokémon. He can jump tree to tree. He can turn into Ash Greninja .
There are 3 evolutions [which means when it gets more skills].
See you next time to learn more.