Quoted By:
I mean, if the in-game name is still "Ash-greninja", then there has to be some sort of explanation for it, right?
However, the anime will never be the same canon as the games, so my guess is that the furthest they go, is that they introduce a new game character named ash
Even if this character happens to have the same pokemon as anime-ash, it's still just a different version of him, so the anime will never be canon