How do you get combusken to learn skyuppercut in Pokemon ruby?

You can't teach Combusken Sky Uppercut in Pokemon Ruby.

Sky Uppercut was introduced in Generation IV (Pokemon Diamond, Pearl, and Platinum). Moves learned by Pokemon are determined by their generation of introduction and the specific game.

Here are a few ways to get Combusken to learn powerful Flying-type moves in Pokemon Ruby:

* Breed: Combusken learns Aerial Ace by breeding with a Pokemon that knows the move.

* TMs: Combusken can learn Fly and Brave Bird from TMs.

* Level Up: Combusken can learn Peck and Double-Edge through level up.

Keep in mind that the best moveset for your Combusken will depend on your team composition and play style. Good luck!