Question

I read on a website (I'm pretty sure it was on Serebii) that if you have a GBA Pokemon game in your DS while you're in certain places in DPP that different Pokemon will come. Is it true, because I almost always play with my Sapphire in, and no new Pokemon came?

Comments

Now you can get an arcanine.
EDIT: if you have fire red I think.

Answer 1

If you put in EMERALD, I know you can get the rare pokemon that are in the special area of the Safari Zone (Pineco, Teddiursa, etc.) I'm not sure about other versions, though.

Answer 2

I know this is a fairly old question, but this link gives exact details
For Diamond/pearl
http://serebii.net/diamondpearl/gbapokemon.shtml
For Platinum
http://serebii.net/platinum/gbainsertion.shtml

Answer 3

Yep, certain version-exclusive Pokemon, such as Growlithe Vulpix, Caterpie, Weedle, Mawile, Sableye, and even Shuckle, will appear if you put in their respective game!