i'm in your conscience
Try reading about the DS Pokemon games (Diamond, Pearl, Platinum, HeartGold, SoulSilver, Black, White, Black 2, and White 2) on Serebii or ask about them in their respective forums. Each of those games I listed has a specific area here on PC and they all have Q&A threads where you can ask about them. Black and White 2 just came out, so I'd definitely recommend them as your next purchase! :) There are lots of Pokemon, new and old, to be caught and plenty to do after the main story.
Also, for future reference, this forum is for the advance generation games, which are Ruby, Sapphire, Emerald, FireRed, and LeafGreen. None of the DS games are in this generation, so even though you were talking about Ruby, it wasn't really relevant to the discussion as a whole haha. Sorry about your fake game though! Legit GBA games are hard to find nowadays. If you still want to get some, try checking local gaming stores. They usually check to make sure that the games still work and are legit, so you won't have that problem again.