My rookies just need more experience outside of fighting my roster. Going up against 100's pushes them and nets them some solid experience, but every trainer teaches their Pokémon differently. They won't get that same variety if they don't get out and fight some real battles.

[And cue a grumble from that disgruntled Dragonite. Who cares about those dumb rookies? They're a waste of time!]

...And I think Draco's just irritated because he didn't get to win a round in the tournament while my Advanced team swept the floor. He doesn't take well to losses.