The X-Men of Earth-20080522 defended the island nation of Genosha. They were led by Magneto after Professor X's murder at the hands of Captain Anarchy of the Revengers.
Earth-20080522's X-Men's roster was extremely larger than Earth-616's.
Nightcrawler (also provisional member of Excalibur)
Shadowcat (also provisional member of Excalibur)
Leech (former member/tool of Revengers)
Pete Wisdom (also member of Excalibur)