Mega Camerupt is the best mega to use on Trick Room teams. The lowest Speed of all fully evolved Pokémon combined with great Special Attack and Sheer Force make it extremely threatening. Its typing gives it useful Steel, Fairy and Fire resistances with an Electric immunity, and it has pretty solid bulk too. While Mega Camerupt is happiest in Trick Room, it can also work well on a variety of team archetypes, like Sun, Sandstorm and even Grassy Terrain.
That said, the lava camel still has its faults. If you can't get Trick Room set up, it really struggles, and Mega Camerupt struggles with Rain teams. But despite its flaws, if you can provide Camerupt with the minimal support it needs it's sure to put in the work for you.
Special Attacker
Camerupt @ Cameruptite
Ability: Solid Rock
EVs: 248 HP / 8 Def / 252 SpA
Quiet Nature
IVs: 30 HP / 30 Def / 1 Spe
- Fire Blast
- Earth Power
- Ancient Power
- Hidden Power [Ice] / Toxic / Solar Beam
Moves
Fire Blast is Camerupt's nuke, with Sheer Force boosting its power to huge levels. Earth Power is the reliable STAB, hitting the Rock-types and opposing Fire-types that resist Fire Blast. Ancient Power OHKOes Charizard-Y and Talonflame. Hidden Power Ice OHKOes Garchomp, while Toxic can be used to cripple walls this set can't muscle through like Poygon2. If you have Sun support, Solar Beam should be used in the last slot to OHKO Slowbro and hit other bulky Water-types hard.
Set Details
248 HP EVs give Camerupt solid bulk, with Special Attack maximised as most of this set's moves are Special. The rest is in Defence to help against physical priority moves. A Quiet Nature ensures you will be as slow as possible, and therefore as fast as possible in Trick Room. If you're running this set outside Trick Room, run a spread of 176 HP / 252 SpA / 80 Spe with a Modest Nature - this lets Mega Camerupt outrun Relaxed Quagsire and 2HKO it on the switch with Earth Power. Solid Rock is Camerupt's best pre mega ability.
Usage Tips
Mega Evolve as soon as you can, as the extra power and bulk are usually more beneficial than the extra Speed. This set can be played as either a late game cleaner or an early to mid game wallbreaker. Bring Camerupt in on Pokémon that can't do much back to it, like Thundurus and Charizard-Y, and fire off powerful attacks. Generally Fire Blast will be your go to move, as it hits much harder than anything else Camerupt has.
Team Options
Trick Room setters are very helpful for this set. Whimsicott can set up Trick Room and Sun for Camerupt, and the 2 get good synergy: Whimsicott resists the Ground and Water moves Camerupt is weak to, while Camerupt resists the Steel, Fire and Poison type moves Whimsicott is weak to. Cresselia can set up Trick Room, Sun and even Gravity, all of which Camerupt can take advantage of. It can also use Lunar Dance to give it a second shot at sweeping. Other Pokémon that can abuse Trick Room like Conkeldurr and Escavalier make good teammates - they can also smash through Chansey.
Other Options
Camerupt can set up Sun, Sandstorm and Stealth Rock - however, it would rather have a teammate do it. Rock Slide can be used, but it doesn't OHKO anything Ancient Power doesn't. Yawn and Roar could be used as phasing options. Will-O-Wisp can be used to cripple physical attackers, although Toxic is generally better on Mega Camerupt.
Checks and Counters
Chansey - Nothing Camerupt has can 2HKO Chansey, while it can cure itself of Toxic with Natural Cure
Water types - Defensive Water types can normally handle one Earth Power and OHKO back with their X4 super effective STABs. Azumarill and Crawdaunt can revenge kill Camerupt in Trick Room with their STAB Aqua Jets. However, if it has Sun Support Solar Beam will do massive damage.
Special Walls - Special walls like Specially Defensive Cresselia can take anything Cmaerupt has and stall it out with Toxic. However, Toxic will put them all on a timer if they lack Heal Bell/Aromatherapy/Refresh