every time you meet cresselia you have to get its HP down with a Pokemon and when its at the end of its HP (RED) you can use ure ultra ball and if it doesnt work ....
make a Pokemon learn false swipe wich is speed is faster that cresselia .
my torterra is lvl80 and it used frenzy plant and it got its hp down to 10 and then my scyther used false swipe and it was 1 HP and then it took me two times with an ultra ball
Good luck with youre tries
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you need don't to get the TM mean look its easier catching a Pokemon with that move such as Golbat at Snowpoint city
most golbat know mean look and giratina knows block
Yes, it does it causes cresselia and mespirit to not run away for a few turns.
It will keep fleeing unless you have a Pokemon with Mean Look or something like that so it won't escape. Try catching a wild Golbat. The same is for Mespirit.
Zubat, Golbat, Gastly, Haunter, Gengar, Jynx, Crobat, Umbreon, Murkrow, Misdreavus, Smoochum, Sableye, Duskull, and Dusclops can learn mean look by leveling up. By breeding, Grimer, Muk, Ralts, Kirlia, and Gardevoir can learn mean look.