>>26825750And then in DP, he was the only one to take down any number of Pokémon belonging to the eventual winner. He got even better than he was before, back in AG. And then they reset him.
The problem is that he eventually will have to win the Champion's League, or whatever 'next level challenge' they place before him. Even if they take him to Alola, if he's just as strong as he is now, he'll only get stronger there, and he'll only get stronger after that.
If he's never reset, he'll have to win everything eventually. In the end, those are the only two options, even if him being reset is a long time from now.