You ca only get it in the winter in Mistrilton Cave, Route 7, Twist Mountain, Icirrus City, or Route 8.
I got mine in Icirrus City
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there is no defog in pokemon black/white
Rollout isn't a TM.
I don't believe there is a TM for Agility. :(
u can't get it it is not a tm
you can't. earth power is unobtainable as a tm.