You have to fight Darkcir.

already did but i found out what to do already

need help with that?i know what to do.wait three days(in the game)after you beat
darkri.manaphy will return!then he will join your team(you have to recruit manaphy to
evolve).then wait three more days(in the game)and manaphy will tell you about a place
called marine resort then you can evolve. you don't need to beat marine resort you just
need to unlock it.you also need to recruit palkia by fighting him again. =hope this help
:D good luck!

you cant evolve your main character until you have phoine,manaphy,dialga,palkia,cresselia
and to of beaten darkri

beat darkrai and unlock the marine resort

just beat darkrai

pokesaur u dont need phione dialga or cresselia i should know ive beaten the game and
evolved