For the most part, Rogue will be tagging along with Kate to help heal people during the big fight! (Via borrowing Kate's power.) She's not physically up to actual fighting at this point, and that's going to really bother her.
However, if any powered fighters need some quick power backup, that's her jam. She doesn't need training to use someone's borrowed power/skills well, in fact canonically she's sometimes had better control than the original owner. Anyone she touches to borrow powers will also end up in her head, though. Dirty secrets, hidden desires, the whole shebang. Since it would be short contact, though, she wouldn't have access to memories/etc for very long. Likewise, her power borrowing lasts about a 1:60 second ratio.
no subject
However, if any powered fighters need some quick power backup, that's her jam. She doesn't need training to use someone's borrowed power/skills well, in fact canonically she's sometimes had better control than the original owner. Anyone she touches to borrow powers will also end up in her head, though. Dirty secrets, hidden desires, the whole shebang. Since it would be short contact, though, she wouldn't have access to memories/etc for very long. Likewise, her power borrowing lasts about a 1:60 second ratio.