I'm playing White 2 and I've just got the 8th badge and the rival and I have jut split up to look for Team Plasma. I've looked online and it says that to proceed, the Plasma Frigate is off of Seaside Cave-- BUT you need the Colress MCHN to get out there. I don't _have_ Colress MCHN because Colress and Terrakion don't appear when I enter Route 22 (as they should). The only thing that I can think might cause this is I beat both Route 22 and Seaside Cave before getting the gym badge to level grind.
Is there anything I could possibly do other than just restarting the game to fix this?