I've been having issues combating Mario in PM.
I first of all can't seem to approach him at all because of fireballs, Nairs sometimes work, but he always spot dodges into a grab and then combo's me like crazy with dash attacks finished with a Usmash that deals me about 40% if I'm at 0 when I begin.
I can't maintain control of center stage because of the flaming balls of death, and when he pulls me to the edge he knocks/throws me off before using his cape on me as a punish for not sweet spotting my recovery; it makes me want to rage quit.
Also as a more general question as a newbie to PM, what should I work on first? I have L-Canceling down mostly, SHFFLing, and wave bouncing the Falcon pawnch (fun times). I'm working on moonwalking (compared to M2K though, I would be a crying shame), getting my knees to connect, and getting off autopilot during battles.
I haven't even started DI'ing (unless I'm jiggs) wavedashing/landing, or DACUS.