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Papalax (Snorlax) (M) @ Iapapa Berry
Ability: Gluttony
EVs: 188 HP / 176 Def / 144 SpD
Careful Nature
- Curse
- Recycle
- Facade
- Earthquake
Mamabuzz (Mandibuzz) (F) @ Leftovers
Ability: Overcoat
EVs: 248 HP / 204 Def / 56 Spe
Impish Nature
- Foul Play
- Knock Off
- Roost
- Defog
Ability: Gluttony
EVs: 188 HP / 176 Def / 144 SpD
Careful Nature
- Curse
- Recycle
- Facade
- Earthquake
Mamabuzz (Mandibuzz) (F) @ Leftovers
Ability: Overcoat
EVs: 248 HP / 204 Def / 56 Spe
Impish Nature
- Foul Play
- Knock Off
- Roost
- Defog
As pointed out by the previous posters, Mandibuzz completely stops Klefki from doing it's thing and decently handles the rest of the team as well, however I've opted to go physically defensive with it's EV spread to improve it's matchup against Scizor if rocks are up or if it happens to be running Life Orb instead of Lum, the spread also just barely avoids the 2HKO from any M-Sharpedo running Ice Fang so you won't be caught off guard by a change to the set. This does come at the cost of having a harder time with Latias and special attackers in general however.
Snorlax on the other hand nearly solos this team after a single Curse and makes for a solid wincon in general, taking only 42% at max from Lati's Draco, 59% max from Mega-Sharpedo's Crunch before a Curse, and 52% max from Mamo's EQ before a Curse. The only real issues Snorlax faces is getting T-waved by Klefki, getting hit by Superpower before a Curse, or having it's berry removed with Bug Bite or Knock Off, hence my choice to make Mandibuzz it's partner.