The answer would be Rocksmash.
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YOU CAN USE ACTION REPLAY TO MOVE THE BOULDERS INSIDE YOUR BASE
The easiest way is to use a ground-type Pokemon that knows ground-type moves. If you cannot get this, at least get a Pokemon that has a ground-type move. The electric gym will go much smoother if you use a ground-type move or Pokemon (or both).
you have to be the Pokemon eevee and use secret power
easy you just keep it in your pokemon party ( the pokemon you have with you ) and get on your bike and ride back and forth on a straight away piece of grass. A Pokemon egg hatches based on the number of spaces you move in the game, the fastest way to move many spaces is the bike.
Moving rocks is typically the field of HM Strength, or perhaps HM Rock Smash.