Your team is MixApe weak. HP Ice takes down Latias and Dragonite, Grass Knot takes down Swampert, and Meta and Bronzong fall to fire blast. You could either give Latias Surf, or add this starmie.
Starmie@Expert Belt
Ability: Natural Cure
EV's: 4 HP, 252 SpA, 252 Spe
Timid Nature (+Spe, -Atk)...