I know but you can go to it on Diamond and pearl. It's Nothing really after you beat the pokemon league and you have the national pokedex fly to Canalava City. Go acrossed the bridge and go all the way down where the sailor that takes you to Iron Island Go inside his house and a kid is sick in bed talk to the kid and mother.walk out and talk to the sailor He'll let you go to Full Moon Island. The legandary will fly off and you will pick an item up go back and give it to the kid. the Legandary is Cresselia level 50 best to have a masterball at this time cause you can use the tuch screen map and find her in the wild. SHe is like Latias and Latios you can migrate at this time go to `route 221 and there will be a building go insid and save it shut the game off and put in an gba pokemon game turn the game on and click start or a button once you will see migrate from yuta game best to pick the pokemon with master ball equipt to it then talk to the guy that lets you in the park the park balls are like master balls so dont worry and you have to catch all 6 to keep them and you only can pick 6 a day or 24 hours since you migrated from that game you still can migrate from other games too.