You can try Togekiss + Hippowdon.OK, what about covering Mega Lopunny, Mega Zard X, possibly Zard Y, setting and removing rocks, and of course Serperior, in only 2 Pokemon. I can't find a good combination to do that. It's fairly frustrating.
Togekiss is the defogger and it basically hard counters Serperior. With 68 Defense EVs it avoids the 2HKO from Mega Lopunny so it can check that too, and in a pinch it can survive a Fire attack from either Charizard and Thunder Wave it.
Hippowdon sets up Stealth Rocks, checks Charizard X and also counters Mega Lopunny in case Stealth Rocks are up on your side. Hippo's sand can disrupt Charizard Y and it can OHKO with Stone Edge. While Hippo can only switch in on Roost or Solar Beam, if you can get it to switch in on a Solar Beam than you can force Charizard to stay in for another turn and then KO it.
Togekiss @ Leftovers
Ability: Serene Grace
EVs: 252 HP / 68 Def / 188 SpD
Calm Nature
IVs: 0 Atk
- Thunder Wave
- Air Slash
- Defog
- Roost
Hippowdon @ Leftovers
Ability: Sand Stream
EVs: 252 HP / 152 Def / 104 SpD
Impish Nature
- Slack Off
- Earthquake
- Stone Edge
- Stealth Rock
Ability: Serene Grace
EVs: 252 HP / 68 Def / 188 SpD
Calm Nature
IVs: 0 Atk
- Thunder Wave
- Air Slash
- Defog
- Roost
Hippowdon @ Leftovers
Ability: Sand Stream
EVs: 252 HP / 152 Def / 104 SpD
Impish Nature
- Slack Off
- Earthquake
- Stone Edge
- Stealth Rock
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