Hippowdon @ Leftovers
Ability: Sand Stream
EVs: 252 HP / 144 Def / 112 SpD
Impish Nature
- Earthquake
- Stealth Rock
- Slack Off
- Stone Edge
Hippowdon checks Talonflame, Mega Charizard X, Toxicroak, Mega Beedrill, defensive Heatran, Bisharp, Diancie, Thundurus, and Mega Charizard Y, all the while providing valuable Stealth Rock support. In return, Clefable deals with most Water-types such as Slowbro and Keldeo and Gengar with Grass-types such as Celebi. Needs a more solid answer to Choice Specs Keldeo and Manaphy however if Hippowdon is chosen.
Sableye @ Sablenite
Ability: Prankster
EVs: 252 HP / 112 Def / 144 SpD
Careful Nature
- Knock Off
- Will-O-Wisp
- Recover
- Foul Play
It might seem redundant at first due to Mega Sableye sharing the Ghost typing with Gengar, but Mega Sableye is a decent partner for such a core due to its ability to handle key threats such as Mega Metagross, Gengar, Heatran, Bisharp, Beedrill, and Gothitelle. It appreciates Clefable's ability to handle opposing Mega Sableye, Keldeo, Mega Lopunny, and Kyurem-B, and Gengar's ability to beat Clefable and spread status. It also helps Gengar spread status via its own Will-O-Wisp to strengthen Hex. Fits well together with other entry hazard users to form hazard-stacking balance which is cool for Mega Sableye.