is the anime canon now ? what is "Ash" and will we see it in sun/moon?
Ash-Greninja has powered up thanks to the strength of its bonds with Ash. This is the form Greninja takes when it has gained new power due to the miraculous occurrence known as the bond phenomenon. This can be brought on by the bonds between people and Pokémon. It seems that it has only known to have occurred once—several hundred years ago.