In other gens:

Quagsire

Type	Water Ground Immune to: Electric Resists: Fire Poison Rock Steel Very weak to: Grass
Abilities	Damp Prevents Explosion and Self-Destruct while this Pokemon is active. Water Absorb This Pokemon heals 1/4 of its max HP when hit by Water moves; Water immunity.
Tier	UU

HP:

Attack:

Defense:

Sp. Atk:

Sp. Def:

Speed:

Evolutions

Wooper
- Quagsire

Strategies

Formats:

Overview

Has a hard time in standard play, though Water Absorb is a lot of fun. The Counter set works the best there. Quagsire is an excellent UU Pokemon, quite hard to consistently beat. And if you're insane, it can counter Kyogre in Ubers (can't do much else though).

Curse

Move 1

Curse
Curses if Ghost, else -1 Spe, +1 Atk, +1 Def.
Type Normal

Move 2

Earthquake
Hits adjacent Pokemon. Power doubles on Dig.
Type Ground
Category Physical
Power 100 BP
Accuracy 100%

Move 3

Ice Beam
10% chance to freeze the target.
Type Ice
Category Special
Power 95 BP
Accuracy 100%
Surf
Hits foes. Power doubles against Dive.
Type Water
Category Special
Power 95 BP
Accuracy 100%
Hidden Power Rock
Varies in power and type based on the user's IVs.
Type Normal
Category Physical
Accuracy 100%

Move 4

Rest
User sleeps 2 turns and restores HP and status.
Type Psychic

Item	Leftovers At the end of every turn, holder restores 1/16 of its max HP. Chesto Berry Holder wakes up if it is asleep. Single use.
Ability	Water Absorb This Pokemon heals 1/4 of its max HP when hit by Water moves; Water immunity.
Nature	Brave Sassy
EVs	252 HP 64 Atk 192 SpD

The UU Swampert, except with Water Absorb. Still, Swampert is better in standard play unless you have a big weakness to Water. Curse up, launch STAB Earthquakes, hit Flying types with Ice Beam or Hidden Power Rock, and Rest when health is low or you've been statused. Chesto Berry is an option, because Quagsire doesn't have quite the staying power of Snorlax and Swampert to Rest without support, though I always use Leftovers.

Counter

Move 1

Counter
If hit by physical attack, returns double damage.
Type Fighting
Category Physical
Accuracy 100%
Priority -5

Move 2

Earthquake
Hits adjacent Pokemon. Power doubles on Dig.
Type Ground
Category Physical
Power 100 BP
Accuracy 100%

Move 3

Toxic
Badly poisons the target.
Type Poison
Accuracy 85%
Haze
Eliminates all stat changes.
Type Ice

Move 4

Surf
Hits foes. Power doubles against Dive.
Type Water
Category Special
Power 95 BP
Accuracy 100%
Ice Beam
10% chance to freeze the target.
Type Ice
Category Special
Power 95 BP
Accuracy 100%

Item	Leftovers At the end of every turn, holder restores 1/16 of its max HP.
Ability	Water Absorb This Pokemon heals 1/4 of its max HP when hit by Water moves; Water immunity.
Nature	Relaxed
EVs	252 HP 68 Atk 100 Def 88 SpD

Counter is awesome on Quagsire. About every Choice Bander in the game, from Aerodactyl to Salamence to Tauros will fail to OHKO Quagsire and be killed by a Counter. You can use Haze to make Quagsire a Suicune counter of sorts, and to force physical attackers to hit you instead of stat up. Toxic is awesome if you're playing UU, since Rest isn't as common there. Last move, either Ice Beam or Surf, is to hit stuff like Gengar and Donphan. Remember, you can counter all Hidden Power, even Hidden Power Grass.

EVs

Cursing version wants lots of HP and Special Defense. Adamant or Careful when not using Surf / Ice Beam, and Brave / Sassy when you are. The leftover EVs should go in Attack or Defense. For the Counter version, probably Impish, almost max HP, and a nice load of Defense to be able to take more hits. After that, stack Attack EVs.