Muk

Stench
Decreases wild encounter rate (no effect in battles).
Sticky Hold
This Pokémon's item cannot be removed. Increases the chance of encountering Pokémon while fishing.
Type Tier
Poison UU
Level 100 Statistics (see level 5, 50, 100)
Min- Min Max Max+
HP
105
- 351 414 -
Atk
105
221 246 309 339
Def
75
167 186 249 273
SpA
65
149 166 229 251
SpD
100
212 236 299 328
Spe
50
122 136 199 218
Name Item Ability Nature

Curse

Leftovers Sticky Hold Careful
Moveset EVs
~ Sludge Bomb
~ Curse
~ Hidden Power Ground
~ Toxic
252 HP / 106 Atk / 152 SpD

Muk in uber play. Thanks to Sticky Hold and Toxic immunity it can come in on Deoxys-D, and it threatens everything that relies on Recover for its health with its own Toxic. Cursing up shouldn't be too hard with Muk's great Special Defense. Hit Metagross and Psychic Jirachi (the latter is uncommon) on the switch with Hidden Power Ground.

Other Options

Body Slam can paralyze the opponent, and paralysis is always good. Imprison is very unorthodox and works in very rare circumstances, stay away from it until you've tried out the standard Muk. Memento can make your opponent's Pokémon harmless, so you can set up a Belly Drummer next turn. Explosion is more recommended for suicide, though. Thunderbolt and Flamethrower are alternate options of hurting Skarmory and some other counters, but you should try to abuse the higher Base Power (as well as Thunder's higher paralysis chance). Rest, with or without Sleep Talk, makes your Muk live longer. It's really an easy switch for counters though.