Lapras @ Choice Specs
Ability: Water Absorb
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
- Freeze-Dry
- Hydro Pump
- Ice Beam
- Hidden Power [Fire] / Frost Breath

Lapras @ Leftovers  
Ability: Water Absorb  
EVs: 248 HP / 252 SpD / 8 Spe  
Calm Nature
- Whirlpool / Block  
- Perish Song  
- Freeze-Dry  
- Rest
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Optional Move(s): 
- Avalanche
- Blizzard
- Curse
- Dragon Dance
- Rain Dance
- Rest
- Signal Beam
- Sleep Talk
- Surf
- Thunderbolt
- Waterfall
Optional Item(s): 
- Assault Vest
- Life Orb
- Waterium Z
Optional Ability: 
- Hydration
Optional EV/IV(s): 
- 252 Atk / 4 SpD / 252 Spe (Adamant)
- 252 HP / 4 Def / 252 SpD (Careful)
- 252 Atk / 4 SpD / 252 Spe (Jolly)
- 120 HP / 252 SpA / 136 Spe (Modest)
- 116 SpA / 252 SpD / 140 Spe (Modest)