[Xing*]

Swampert @ Leftovers
Ability: Torrent
Nature: Impish
EVs: 252 HP / 202 Def / 44 Atk[Credit to WildAce for the EV]
- Earthquake
- Waterfall / Avalanche
- Stealth Rock
- Roar / Protect

Stealth Rocker. Mostly a tank, some Atk EV to back up its physical attacking moves. Earthquake is a hit hard strong STAB move, Waterfall or Avalacnhe is up to personal preference. Waterfall gainst STAB, a pure attacking move. But Avalanche covers more, and will become the same power as STABed Waterfall[120] at the cost of going second. Roar for Stealth Rock combo or Protect for Leftovers recovery or maybe just to peek at opponent's moveset. =P

Originally Posted By WildAce
Swampert @ Leftovers
Ability: Torrent
Nature: Relaxed
Evs: 240 HP / 212 DEF / 56 Sp.ATK
- Hydro Pump / Protect
- Ice Beam
- Earthquake
- Stealth Rock

Mixed-Pert.
After approximately an hour talking to Elly on AIM, he convinced me (with Damage Calculations) that this indeed does have it's merits over the Purely Physical Pert.

Protect can also be used over Hydro Pump for two reasons:
- Scouting Purposes (an unexpected Grass Move can spell disaster)
- Leftovers Recovery (6.25% extra HP never hurts).

Credit to ELLY for suggesting this.

Swampert @ Focus Sash / Leftovers
Ability: Torrent
Nature: Calm / Careful
Evs: 252 HP / 252 Sp.DEF / 4 DEF
- Counter
- Mirror Coat
- Protect
- Stealth Rock

This set is essentially a Gimmick, but it works as a Leading PKMN.
The premise is very simple.
Protect to see what's going to happen, then Counter / Mirror Coat is necessary to potentially score the immediate kill.