User blog comment:Abuyama/A little help for Inazuma Eleven GO2 Chrono Stone?/@comment-4684922-20130509155808/@comment-5465760-20130509201031

Ruby can be found in God Eden, near the "Soccer God Statue" (or whatever it's called). Eris, Elite AND Mighty are all three in the team Leo just said. Mighty joins your team after a few battles, and the community master of both Eris and Elite is at the station near Raimon.

Those are all I know.