FIRST... MAKE SURE TO GET MAX REPELS AND DUSK BALLS TOO. GET DUSK BALLS AT DRIFTVEILS POKEMON CENTER. since your already at driftveil, head towards chargestone cave. but instead of going inside, go to the right. you will see a patch of grass.go through it and use surf when you are past the rocks in the water. you will get to a cave which is mistraltons cave. there is a legendary Pokemon deeeeeeep inside called cobalion. it is level 42. dusk balls will help since it is in a cave, and you don't want to run into any stupid level 3 Pokemon, now, do you?
mistralton cave
Find one in the mistralton cave.
Mistralton cave on route 6.
In the topmost floor of Mistralton cave (bring Pokemon that know Flash and Strength)
You can find a Thunderstone in Route 9 and Chargestone Cave. You can find it in dust clouds in the following locations: Wellspring Cave, Chargestone Cave, Mistralton Cave, Challenger's Cave, Victory Road and Giant Chasm.
Cobalion
Cobalion-Mistralton Cave. Zekrom-Dark Stone. Thundurus-randomly but on a route. Terrakion-Victory Road
You get it at Mistralton Cave
mistralton cave
mistralton cave
mistralton cave
In Mistralton Cave
Find one in the mistralton cave.
Axew is available in both black and white, it is found in Mistralton Cave.
Do you mean Mistralton Cave? There are Joltik, Ferroseed, Klink, and the occasional Drilbur and Tyamno.
You have to surf on the river at route 6.
You find Cobalion on Mistralton Cave.