You can't, as it was introduced in Gen 4.
Source: Experience
http://bulbapedia.bulbagarden.net/wiki/Evolutionary_stone
If you want your Kirlia to Evolve to Gallade it is Impossible in Ruby Both Gallade and Dawn stone was introduced in Gen IV
Hope this helps
How to change your username How to add a user avatar Why was my post hidden? Question etiquette Flags vs Downvotes Anime FAQ Official PokemonDb League
Type a Pokemon name, type, move or ability to see instant results.