You have to talk to dawn's or lucas's sister everyday till you get absol
You know mt. Coronet well you go to the snowy place run around a certain rock I'm not sure which because I'm still trying to catch that pokemon (thats why were trying duh : ))))))) well anyway keep running around it and in the end youre bound to catch on e but they are really rare even in the exact spot> :)
On the top of mt cornet
I met one at mt.coronet but it died by hail oh my god
Go to Mint coronet
In the snow area in mt. Cornet they are kinda rare (in tall grass.)
In the snowy part of mount Cornet
In between route 16 and eterna city or celestic town, you can get an absol. But they are really rare so you have to keep on trying!!!