Braviary: Staraptor is better in almost every way.
Staraptor @ Choice Scarf
Ability: Reckless
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
-Close Combat
-Brave Bird
-Double-Edge
-U-Turn
Basically the same logic as your Braviary set, but with better stats. U-turn is used in case you don't feel like getting choice locked.
Dragonite: It's much better as a pure physical attacker, especially since dragon dance only boosts physical attack. Give it 252 Atk/4 Def/252 Spe Jolly. Replace thunderbolt and ice beam with iron head and fire punch for full weakness coverage and hitting everything for at least normal effectiveness.
Blastoise: Tentacruel is much better as a bulky rapid spinner.
Tentacruel @ Black Sludge
Ability: Clear Body
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
-Scald
-Rapid Spin
-Sludge Bomb
-Toxic
This is like Blastoise, but with less weaknesses and toxic immunity. In case you didn't know, toxic can't miss when used by a poison Pokémon.
Garchomp: Replace focus sash with life orb for more damage. Replace crunch with iron head for full weakness coverage.