Kingdra: Good, but I would run a Special set. You can keep your set if you want to, though. For a special set, I would do Draco Meteor, Scald or Surf, Flash Cannon, and Whirlpool. Instead of a Lum Berry, I would run an Eject Pack, White Herb or Binding Band. And for EVs, 252 Speed, 252 Sp. Attack, 4 HP.
Quaqsire: Perfect
Pelipper: Great, but if it's a double battle, I would have Hurricane, Scald, Tailwind, Roost, and a Focus Sash instead of Heavy Duty Boots.
Poliwrath: Good, although I would use Brick Break or Drain Punch instead of Substitute.
Keldeo: Having a move specifically for switch out is useless with a Choice item. I would change Flip Turn to Hydro Pump or Muddy Water, and the EVs to 252 Sp. Attack, 252 Speed, 4 HP.
Barraskewda: Like the above, you can't use a Choice item with a switch out move. If possible, I would change your item to a Life Orb. Not like your gonna need the HP on a barraskewda. If you can't change it, then use Drill Run, to cover it's Ground Weakness.
Hope this helps :)