Speed is good for pivot grabs and Jump is good for off ledge fighting.When I play Shulk, I basically never use Speed or Jump. Buster to rack up damage into Smash, Shield when I'm at a high percent.
At least you're playing Zard. Poor guy is getting shitted on by almost everyone because he's not Bowser, which makes me cry. You just gotta be patient with him and wait for an opening to punish. He's slow, so whiffing anything with him is bad news. However if the opponent screws up, go nuts, Charizard is a punishing machine.
I have over a 90% win rate on For Glory with just using Charizard so I don't think he's bad like everyone is making him out to be.