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Ok this is quite easy, have a crobat and get it too learn the move that prevents Pokemon from escaping (I cant remember what it is called) poison it and just let it weaken, once its health has bar has turned yellow start throwing ultra balls at it, and you should have the cresselia soon after.
What else can I help you with?
Do you have to catch Cresselia to get Darkrai?
no you do not
Can you catch Cresselia on HeartGold?
NO!
Where can you catch Cresselia in Pokemon White 2?
You can catch Cresselia on Marvelous Bridge, but you need the Lunar Wing, which you get in the Strange House.
Where do you catch Cresselia in Pokemon Diamond?
you find cresselia on full moon island
Can you catch cresselia in cerulean cave?
no, cresselia can only be caught in gens 4+
What is the Pokemon you catch on full moon island in pearl?
You catch Cresselia
Where to catch cresslia in diamond?
Technicaly there is no definite place to catch Cresselia. You need to catch up with it after you cure Sailor Edritch's son from his nightmare. If you need further help look up "How do you catch cresselia"
Can you catch Cresselia with a quick ball?
yup its possible
Does mean look help catch Cresselia?
Yes, it does it causes cresselia and mespirit to not run away for a few turns.
Where can you catch Cresselia?
Fullmoon Island you can get there by boat at Canalave City
Can you catch Cresselia on Pokemon Pearl without the national pokedex?
no
What is after Cresselia in diamond?
you are trying to catch, it has good reason to flee!
