Time to hit the water. Reserving for Defensive Empoleon and Quagsire.
Empoleon (defensive)
Type: Water/Steel
Base Stats: 84 HP / 86 Atk / 88 Def / 111 SpA / 101 SpD / 60 Spe
Ability: Torrent
Description
In a metagame where many threats are primarily special attackers, Empoleon's unique Water/Steel typing coupled with it's defensive stats make it a
very good tank. It's typing gives it 11 resistances, and most of them are common attacking types in the metagame including the sought after Water and Rock resists. With a focus on maximizing Special Defense, Empoleon can support a team utilizing coverage moves such as STAB Surf, Ice Beam, Grass Knot and Hidden Power Electric. It can also help the team by using support moves such as Roar and Stealth Rock. Empoleon does face some form of competition from Specially Defensive Heatran. However, Empoleon handles Water types much better than Heatran, particularly Gyarados if Empoleon has Hidden Power Electric. Resist berries such as Shuca and Chople, combined with some Defense EV's, can be used to surprise threats such as Dragonite, Flygon, Offensive Gyarados, and Infernape and OHKO them with the respective coverage move, but Leftovers is the superior option overall.
Quagsire
Type: Water/Ground
Base Stats: 95 HP / 85 Atk / 85 Def / 65 SpA / 65 SpD / 35 Spe
Abilities: Damp, Water Absorb
Description
Quagsire has a specific niche in the DPP OU metagame: it is one of the few hard counters to Life Orb Starmie and Offensive Suicune. Water/Ground is also an excellent defensive typing to ward off popular Electric types such as non-HP Grass Zapdos, Raikou, and Jolteon. Water Absorb is a rare gem to come by in OU since Vaporeon is the only other Pokèmon in OU to wield the ability and it is weak to Electric attacks. With a moveset of Toxic, Encore, Earthquake, and Recover, combined with a Careful 252 HP/56 Def/200 SpD spread, Quagsire is able to switch into any common attack that Life Orb Starmie and Offensive Suicune can throw and neither of them can 2HKO Quagsire, even if Suicune has a boost. Quagsire can effectively stall both threats out. Ice Beam and Ice Punch can also be run over Toxic to deal with Gliscor, Dragonite, and Flygon better, as well as to hit predicted Grass type switch-ins, but you lose out on putting Offensive Suicune and other sweepers on a timer. The dash of Defense EV's allows Quagsire to take on Metagross and come out on top. Take care when considering Quagsire for your team, however, as it does not perform well against stall teams at all. Quagsire fits best on teams where it can give a sweeper free turns as well as teams that struggle with Starmie and/or Suicune in general. It is a viable member of any Fire/Water/Grass core.
lol I didn't put Hariyama's abilities up. Should I add them anyway, even though the Guts lead is the most common set in OU?