Oh, yeah. And you have to learn how to dodge the uber wings of death that Tabuu uses. That is key. If you can't dodge that. There's no way you can beat it. He'll probably do it one to three times when you fight him on intense. And when using Fox, utilize his laser gun as much as you can. It keeps you away from damage and it does pretty decent damage to them over time. In fact, I beat Duon, Porky, and Galeom mostly using the gun.
Hm...I found that Charizard's forward B does an extreme amount of damage. It is almost unreal. If you can dodge well with Charizard and time that attack effectively, it will prove to be very easy with him...but I haven't been able to do it..I got to the eighth boss I think.