>>20510058Cofagrigus is great in Gen 6. It got access to Toxic Spikes which Cofagrigus keeps up with Rapid Spin immunity, great defenses on both sides, Ghost has ridiculous coverage, and Mummy cripples many Pokemon on touch.
Mega Pinsir problems? After Mummy activates, STAB+Close Combat Pinsir can't damage Cofagrigus whatsoever.
Mega Medicham loses Pure Power and can't do much to Cofagrigus anyhow.
Cofa is damn good. I'd recommend a set of Max HP/Def and Will-O-Wisp, Shadow Ball, Toxic Spikes/Pain Split, and haze for moves.
T-Spikes vs Pain Split is just a matter of hazards vs longevity; your choice.