Yanma evolves into Yanmega which is a Gen 4 Pokemon. Ruby, Sapphire, and Emerald are all Gen 3. In other words, Yanma doesn’t have an evolution yet.
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it will evolve when it learns ancientpower at level 33
RAISE YANMA TO LEVEL 33 AND TEACH ITANCIENT POWER
At Level 33, Yanma learns the move AncientPower. If you level it up while knowing this move, it will evolve into a Level 34 Yanmega.
To evolve Yanma into Yanmega he must level up after learning Ancient Power. Yanma will learn the Ancient power ability at level 33.
Yanma doesn't evolve in any of the GBA games. It only evolves in Diamond, Pearl or Platinum.