yes you can find earthquake TM in battle frontier you have to collect enough battle points to buy one
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U go to a lady in a house buy earthquake w/ battle points
you can get it in the wayward cave, battle frontier shop, or a high level Pokemon that has the ability pickup
Its quite a lame battle tower, but you can find it in Seven Island.There is no battle frontier in leaf green.... It's only on emerald.
in the battle tower in the not with a friend multi battle room (by yourself)
you get it at the battle frontier.