Here's why:
* Game Mechanics: Heart Scales are used to teach Pokemon new moves via the Move Tutor, a feature that was not available in Pokemon Ruby.
* Storyline: The story of Pokemon Ruby does not involve any characters or events that would introduce Heart Scales.
Alternatives in Pokemon Ruby:
* TMs and HMs: You can teach Pokemon new moves by using TMs (Technical Machines) and HMs (Hidden Machines). These can be found in various locations throughout the game, purchased, or received as rewards.
* Breeding: Breeding Pokemon with compatible parents can pass down moves to their offspring.
* Leveling Up: Some Pokemon learn new moves as they level up.
If you're looking for ways to teach Pokemon new moves in Pokemon Ruby, explore these alternatives.