Nearly zero characters in all of fiction have a shot at beating Phoenix based on the recent canon within the past year.
She's basically 1 below TOAA. There are only like 10 characters overall who can take her on straight up like Bugs Bunny, Daffy Duck, Road Runner, Woody Wood Pecker, etc.
I think of her as the writers' imagination in character form/labeled as a character. So even then, a Toon Force user would struggle and stalemate.
So her being a legit member of the X-Men when you're talking an all-out fight with everyone at full strength, most franchises are donezo vs that team.
She's basically the X-Men's trump card in any all-out, full-potential fight.
if you say non-WPOTC/Dark Phoenix/etc. though, just her human form with strong telekinetics, then the X-Men vs Capcom fight is a lot more interesting.