First you must have the national pokedex, then you go to canalave and go to the sailors house. there should be a boy having nightmares. Talk to the mother and boy then to the sailor he should take you to full moon island or whatever its called. If you follow the path you come across cresselia and then she flies away leaving the lunar wing. after that you go back to the sailer and give the wing to the boy. to catch cresselia, use your marking map, because cresselia flys away like mesprit. :) Good luck catching it!
You have to go to snow point city to catch him
In your PC
you get wifi connection and go into a cave and catch it
After you beat someone, you have to go to the top of MT. Coronet.-
One can trade Pokemon from Emerald to Platinum using the Pal Park feature in Pokemon Platinum. The Pal Park feature becomes available after completing the Elite Four in Pokemon Platinum. Subsequently, players can transfer Pokemon from Emerald to Platinum via the Pal Park.
yes go to canalave city and go to the other side of the bridge where you will see a sailor by a boat go to the house that is near that and talk to the little boy's mom then talk to the sailor and he will take you to an island where you will go through a passage in the trees and there you will find cresselia but cresselia runs so once you find it you will have to use a poketech app to find her like with mesprit on Pokemon diamond.
You have to get the National Dex, then go to Full Moon Island.
You can get it without action replay after u get national dex go to new moon island i think and u will see cresselia and it will run away once u have locator it will show up as a rare Pokemon on ur locator and just get to where it is and catch it
in the morning you go to canaclave city into the inn, and youll get the location of new moon island (next to,but not surfable to from fullmoon island where cresselia is) and you challenge darkrai, and like cresselia and messpirit chase it down, (i recomend a high-level goldbat with meanlook and a Pokemon with falseswipe and hypnosis to catch it)
go to Pokemon merriland . com
In order to catch Cressilia you need to get the national dex, which you need to see all 210 Pokemon. After you receive the national dex go to Canalave City and go to house right above the ferry. In here talk to the mother and she will tell you about her son not walking up from his nightmares. Tell her that you will help and go outside and talk to the sailor by the ferry. He will then take you to Fullmoon island. This is the place were Cresselia, once you click on cresselia though it becomes a roaming Pokemon in which you need to track it down and catch it.
you have to go to lake verity cavern and catch it.
You have to go to snow point city to catch him
In your PC
depending on where you go and what you do you can catch all of them, every Pokemon in existence
go to pal park
first beat the league then head to the sailors boat he says his son is ill and only a lunar wing can cure him he takes you to an island wher you encounter cresselia as a sprite talk to it and it fly's away leaving the lunar wing give it to the sick child then you can catch cresselia the same way as mesperit and if you don't have the marking map go to jublife city and go to the poketch company and talk to a guy who will give it to you.