I'm guessing you're playing Platinum, so you go thru mount coronet, going all the way north. here is a link to the walkthrough i used, just go in order starting from #67, just copy and paste it into your search bar at the top of your page.
http://www.YouTube.com/watch?v=wHNS8GNBa8A
You have to go to snow point city to catch him
Go to lake verity.
Yes, that's correct.
You go to Candice in snow point city.BUT TRY TO GET DEFOG.
THERE IS ITS AT SNOW POINT CITY well near there
snow point temple in snow point city its at the top of the town map
snowpoint city
if in the sinnoh region you get it at the snow point city
In snow point city
go to mont corret
break the snowballs
Snow point city
use a pokemon to use fly to snow piont city gym and go to the harbor on the north
Skill.
On the way to snow point city.
Under snow point city.
you can get absol but only by snow point city