>>12738746I do that because my personal "challenge" is to never ever grind (after they start to become more common, usually after the first gym, I only battle trainers, wild pokémon only if I want to catch something or if they won't let me escape) so my pokémon will often end up to over 10 lvls under the weakest pokémon of some mid to end game gym leaders, the E4 and the champion, specially because I also change my team often during the game, which wastes some of that trainer exp along the way.
I use set for regular trainer battles, though, even when those also start to greatly outlevel me.