In Pokemon Ruby destiny how do you get rock smash?

You can't get Rock Smash in Pokemon Ruby Destiny. It's a move introduced in later generations of Pokemon games.

Pokemon Ruby Destiny uses the mechanics of Pokemon Ruby, which means it doesn't include moves like Rock Smash.

If you're playing Pokemon Ruby Destiny and need to break rocks, you'll need to find another solution, like using a Pokemon with a move that can break rocks, like:

* Explosion: This move can be learned by Pokemon like Chansey and Voltorb.

* Rock Tomb: This move can be learned by Pokemon like Geodude and Graveler.

Remember, Pokemon Ruby Destiny is a fan-made game, so the rules and mechanics may differ slightly from the official games.