Pokémon Ruby Tips

Hatching Eggs Easier
The ability "Magma Armor" which is known by Slugma or Magcargo and "Flame Body" which is known by Slugma, Magcargo, Magby and Magmar halves the steps you need to take to hatch an egg if the pokemon with this ability is in your lead, or the first in your party.

NOTE: Having more than one of these pokemons would not keep halving the number of steps. Make sure you have the pokemon as your lead.