Umm, I'm pretty sure Blissey's Ice Beam can OHKO it. And if Quasire's Waterfall is a 2HKO, and if Gliscor can't retrun KO then it's not necessarily a check.Gliscor @ Toxic Orb
If not, it doesn't instantly die to either of the above's attacks,
Heatran @ LeftoversCountering Cloyster:
Sableye@Leftovers
Ability: Prankster
EVs: 252 HP / 4 Def / 252 SpD
Nature: Careful
-Will-O-Wisp
-Recover
-Foul Play
-Taunt
Sableye can come in and Will-O-Wisp Cloyster, rendering it nearly useless, unless it spams Hydro Pump. After Will-O-Wisping, Sableye can Taunt to prevent any Shell Smash shenanigans, or if it predicts correctly, it can even catch Cloyster by surprise with a Foul Play as it Shell Smashes.
Clefable @ Lum BerryHeatran @ Leftovers
Ability: Flash Fire
EVs: 252 HP / 252 SAtk / 4 SpD
IVs: 0 Atk (minimal Foul Play damage)
Nature: Modest
-Toxic
-Swagger
-Magma Storm
-Substitute
Technically, nothing has 100% chance of beating this set.
Anyways, switch into Sableye's Will-O-Wisp, blow it to shreds with Magma Storm, which handily deals DOT, and traps them. Swagger confuses and Toxic poisons to abuse the trapping effect, plus the damage starts to really stack.
Rotom-W w/ Light ClayBreloom would be too boring as a counter. Besides, this Pokemon kicks butt much more.
Azumarill @ Choice Band / Muscle Band
252 HP / 252 Atk / 4 Spe Adamant
- Waterfall
- Aqua Jet
- Ice Punch
- Superpower
I haven't seen Azumarill in DW OU, and I really wonder why. Double STAB priority Aqua Jet with Choice Band and an attack stat of 436? Really? When the rain is up, Azumarill is basically unstoppable. While Choice Band is a great choice, Muscle Band also works as a fake-out to trick your opponent into thinking you've been move locked. Ice Punch kills dragons, Waterfall gets extra damage, Superpower rounds off the coverage.