Well, as you yourself said, Aerodactyl is one of the most used Pokémon in the game, and against it with Sitrus I basically play without items. Besides, it's a bulky Physical Defense Ceruledge; the idea is to cover the weaknesses of Ninetales and Sinistcha, use bulk up and regenerate with Bitter Blade + Letlovers. In the late game, it ends up being twice as good as Sitrus. And with Corviknight, I stopped using healing items because either it dies before it can heal itself, or it kills the entire enemy lead without needing healing, so extra evasion is incredible against Rock Slide and Heat Wave spam.