I dont know why but sometimes i am not able to mega evolve charizard to its x form even though he has his mega stone on him. is this a bug?
When you use the mega stone have you already used the M.stone for another Pokemon in your party? For instance, using D.Galladite and then sending out Charixard?
Dying in mega form and rezing, doesn’t let you use mega evolve twice if this is your situation