Help with Gen V team

[Jolteon*]

The following is my doubles team.I need help with moves/finding a fifth

Excadrill @ Air Balloon
Nature: Jolly
EVs: HP 4, Attack 252, Speed 252
Ability: Sand Rush
Moveset: Swords Dance, Earthquake, X-Scissor, Rock Slide

Ferrothorn @ Shell Bell
Nature: Careful
EVs: 4 HP, 252 Defense, 252 Sp. Def
Ability: Iron Barbs
Moveset: Sandstorm, Toxic, Gyro Ball, Curse
Strategy for leads: Use sandstorm to activate Excadrill's ability, and use swords dance. Then poison both of the opponents and use curse a bunch until Gyro Ball is super duper. Meanwhile use attacks that are super-effective with excadrill or rock slide if none are and that is neutral (because it hits both).

Hydreigon @ Choice Specs
Nature: Modest
EVs: HP 4, Sp Atk 252, Speed 252
Ability: Levitate
Moveset: Draco Meteor, Surf, Dark Pulse, Focus Blast
Strategy: Revenge killer...

Volcarona @ Leftovers
Nature: Timid
EVs: Defense 4, Sp. Atk 252, Speed 252
Ability: Flame Body
Moveset: Hurricane, Quiver Dance, Fiery Dance, Bug Buzz
Strategy: Quiver dance for the initial boost, then what ever would do the most damage, or Fiery Dance if none are super effective for that extra Sp Atk boost.

Krookodile @ Choice Scarf
Nature: Adamant
EVs: 4 HP, 252 Attack, 252 Speed
Ability: Moxie
Moveset: Stone Edge, Earthquake, Pursuit, Crunch
Strategy: Use best fit attack unless it is obvious that they will switch, in that case use pursuit.