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Hard Mode: No Ultra Beasts or Legendaries.
Toxapex @ Black Sludge
Ability: Merciless
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Toxic Spikes
- Baneful Bunker
- Liquidation
- Recover
The basic idea behind this set is that Toxapex has enough defenses as it is. By pumping points into HP, both are enhanced further. By making it Adamant and pumping points into Atk, it'll hit much harder than expected.
Toxic Spikes are a must. Toxapex has enough defense to almost certainly get out two layers before needing to Recover. Baneful Bunker effectively just acts like Protect, giving an additional turn for poison to take its toll and for Black Sludge to heal. It can also be used to poison flying or levitating targets that may have switched in over Toxic Spikes, or targets that were in before Toxic Spikes were out. Recover speaks for itself.
I chose Liquidation for two reasons. One is that it's a hard-hitting STAB, and with a guaranteed crit through Merciless, it should be able to do at least decent damage to most targets. The second is the fact that it can lower enemy Defense, which can not only assist with the kill, but also force a weakened opponent to switch out, throwing another Pokémon into the Toxic Spikes.