Floatzel @ Choice Band  
Ability: Swift Swim  
EVs: 252 Atk / 4 Def / 252 Spe 
Jolly Nature  
- Waterfall  
- Aqua Jet  
- Crunch / Return / Ice Punch
- Pursuit / Return / Ice Punch

Floatzel @ Mystic Water  
Ability: Swift Swim  
EVs: 100 Def / 192 SpA / 216 Spe  - physical based with Waterfall and Ice Punch is possible too but usually inferior.
Timid Nature  
IVs: 0 Atk  
- Surf  
- Toxic  
- Taunt  
- Ice Beam  

Floatzel @ Leftovers  
Ability: Swift Swim  
EVs: 252 HP / 4 Atk / 252 Spe or 80 HP / 252 Def / 176 Spe (older spread that cheats on speed for some bulk. would currently recommend maxing.)
Jolly Nature  
- Bulk Up  
- Waterfall  
- Substitute  
- Baton Pass