I'll say it right now, DDD has nothing even APPROACHING a flame-retardent body, and honestly nothing of that composition will work that's organic.
He's also got the mk/kirby problem, no knees so he's slow and can't really jump, he's also a massive target. His clothes don't help, they're easy to catch fire.
It's not even about a campfest, zard can just glide in and start frying him from a safe distance and there's really nothing that DDD can do about it because he's far too slow to dodge and zard outranges him.
And if the fire touches him at all, his clothes/flesh will catch fire, and he'll burn to death, if it's just a glancing blow, he'll need to devote time to stop drop and roll, which will give charizard plenty of time to finish the job.
Zard's victory, think Zelda vs. peach level.
No, our boi is legit.
Btw, pit can only have swords OR arrows, tru facts, metal bows do not work, too much resistence for a human to pull, part of why he lost last round.
Since smash is non-canonical, go with the arrows.