Don't know why people are surprised Volcarena is better than Charizard. Volcarona has one of the best boosting move in the game, Quiver Dance. This move alone made VENOMOTH a higher tier than Charizard (along with tinted lens and other stuff). Since you don't play competitive you probably just brute force your way through everything and not realize that boosting moves are vital for sweepers. Also Volcarona has better stats for a sweeper too. Charizard isn't good because his stats and movepool don't fit each other, his typing, no very viable boosting move supporting his best stat, and a bad ability (except solar power which is insanely hard to get legit.