The easiest way is to catch a Timburr and teach it Rock Smash.
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Lenora, the second gym leader, is found in her gym AKA the museum in Nacrene City.
Beat the Pokemon league!
Lenora why are you asking this you are dumb
You have to Beat Prof.Oak and Beat him with a Pokemon with "Rough Pearl" Attached to it.
you can get one from lenora when you get the dragon skull back