What Pokemon is 488?

The Pokemon is Cresselia. to get her you fill your national dex. go to canave land and go to the sailors house. go in. theres a boy laying in bed talk to him. then go out and talk to his dad hell take you to cresselia talk to cresselia.shell give you something. then shell run go back to the sailors house talk to the boy hell wake up.

then you find cresselia like mesprit

Hope that helps dude or dudeette