Phoenix shouldn't be far behind Apocalypse in raw power, but its hard to say if
Spoiler:. I'm sure if he wasn't as hampered he could withstand a direct attack, and then be able to respond. So for the moment I'd rank him as greater
she could overwhelm him similarly seeing as he was engaging all of the Xmen simultaneously and they couldn't beat him
Apocalypse
Phoenix
Erik (With helmet to resist tp/his full potential realized)
Charles
Quicksilver
Storm
Everyone else