This is my first post so try not to judge.
Centiskorch @ Leftovers
White Smoke - if you do not want your stats to get lowered (lose your Coil)
Flash Fire - immunity to Fire + 50% Attack boost if hit
EVs: 252 Atk / 252 Def/SpD/Spe
-Coil - better version of Bulk Up. Accuracy can help with Inferno.
-Inferno - for damage and mostly burn. Accuracy boosted by Coil + STAB. Special Attack isn't too bad.
-Fire Lash - damage + STAB + Defense lowering for more damage. Not too bad for G-Max Centiferno.
-Flare Blitz/ Burn Up / Bug or Grass type move / Thunder Fang / anything you like
Flare Blitz- damage + STAB
Best move that it can learn for G-Max Centiferno
Burn Up - to reduce weakness but also reduces resistance. Flash Fire still blocks Fire. Damage + STAB
Bug for STAB
Grass for coverage
Thunder Fang for coverage + effects