By rotation I mean Ash forgets to bring his other Pokémon along, which is why Sirfetch'd only ever turns up to lose. We could have got a training episode with Sirfetch'd like learning a STAB move that does damage. So no, I wouldn't say most development is done, especially since we never get to see Pokémon interact.Maybe not. If his last several matches with Volkner, Bea, and Marnie are any indication for the more difficult fights to come, he's fully capable of pragmatically switching when necessary and battling optimally with his various powerups.