By defeating the the fourth gym leader
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If it is a round boulder then use strength, otherwise if it is a rock use rock smash.
You teach an able Pokemon to use it, and when they do, if you see a boulder that is outlined darker than the other boulders, and is in more of an oval shape, if you click A, you should be able to move it if the Pokemon that you taught strength to is in your party
You don't. You have to trade an eevee to Pokemon Ruby to use one in the game.
The fourth gym.
Skitty evolves into Delcatty through the use of a Moon Stone in Pokemon Ruby and Sapphire.