go to fullmoon island and get the lunar wing give it to the sick kid and tada
There is no possible way to get Cresselia in Black or White, unless you use PokeTransfer or Dream World.
This is the same way from Diamond and Pearl.
chase it with the first team member that is faster than it and teach the mean look so the Cresselia can't run
i'd say cresselia because its a level 50 when you get it. darkrai on the other hand is AWESOME TOO but you get it at level 40.
I am very sorry but there is nothing you can do if you saved the game. If you didn't, then you will be able to encounter her the same way as earlier.If you did safe the game after you fainted Cresselia, you may be able to persuade a friend to trade Cresselia with a Pokémon that you have caught.
After a little while into the post game, Cresselia starts appearing into your dreams or at least Darkrai is. He was pretending to be Cresselia. Cresselia is really good, but the Cresselia in the dreams are Darkrai's doing.
buy 5 ultra balls 5 timer balls and 5 dusk balls. cresselia is at the top the mountian. GOOD LUCK!
I looked it up, you can get Cresselia, but it doesn't say how. It only says you can get Cresselia at Sharpedo Bluff.
you find cresselia on full moon island
no, cresselia can only be caught in gens 4+
Well, Ice beam for a Choice Specs Cresselia and Icy Wind for a Cresselia with high stats on defense
If Cresselia disappeared off of your map completely, then you have already caught Cresselia, or there is a glitch in your game where Cresselia has just disappeared off of your map. Further details would be needed for a more in-depth assessment as to why this has happened if neither of the two reasons stated are why Cresselia isn't on your map.