The following are Crashe Wake's Pokemon;
Gyarados @ (Nothing)
Ability: Intimidate
Level 33
~ Waterfall
~ Brine
~ Bite
~ Twister
Quagsire @ (Nothing)
Ability: Damp
Level 34
~ Water Pulse
~ Mud Shot
~ Rock Tomb
~ Yawn
Floatzel @ Sitrus Berry
Ability: Swift Swim
Level 37
~ Brine
~ Crunch
~ Ice Fang
~ Aqua Jet
Obviously, use Electric/Grass type attacks to deal with him. It'll help if you have Thunderpunch Infernape or Torterra with a grass attack.