In ORAS battle resort theres an old man who says a bunch of crazy stuff. What did he say, and is there something like a side quest?
Are you talking about this guy?
If so, he is speaking in Japanese. This is the translation of what he's saying:
>"I can tell by the look of you you're no ordinary trainer. I'd recommend training up some more, and challenging the Pokemon World Championship."
It's not a side-quest, it's basically a promotion for Pokémon VGC tournaments.