Camerupt

Mega Camerupt is a potent tank that rips through many common threats thanks to a combination of Sheer Force, a sky-high Special Attack, and powerful STAB attacks, as well as a unique Fire / Ground typing and impressive defensive stats. With five resistances and an immunity, Mega Camerupt checks many common threats, such as Escavalier, Eelektross, and Jolteon. Between Fire Blast and Earth Power, Mega Camerupt has solid coverage that allows it to run Stealth Rock to provide team support and Toxic to cripple checks such as Alomomola and Jellicent or Hidden Power Ice to hit Flygon.

Mega Camerupt's typing may only give it two weaknesses, but unfortunately they are a 2x weakness to Ground-type attacks and a 4x weakness to Water-type attacks, both of which are extremely common. It's also easily worn down because it lacks any form of recovery and is hurt by all entry hazards, taking neutral damage from Stealth Rock. Additionally, with a wretched base 20 Speed, Mega Camerupt is easily one of the slowest Pokemon in RU, only outspeeding Ferroseed and Speed tying with Escavalier.