Emerald by far
Emerald.
Ruby and Emerald.
You can't catch it in Pokemon Sapphire, Ruby, Emerald. The only way to obtain it is to buy it in the Game Corner for 9999 slot coins in Pokemon FireRed and LeafGreen and then trade it to your Ruby/Sapphire/Emerald game.
Pokemon Emerald,Ruby and Sapphire
To get an aipom in ruby, you must trade from emerald. Emerald is the only game in which you can get G/S/C pokemon.
Technically speaking, Emerald, but they're really about the same. Get the easier to find/cheaper buy.
in my opinion emerald is way better than ruby. that is because there is battle frontier in emerald and in emerald we get a jotho starter pokemon from prof. birch after beating hoen dex!
You can't get Eevee in Pokemon Emerald/Ruby/Sapphire, you have to trade it from another game.
Sapphire came along with Ruby after Ruby Emerald came.
pokemon ruby, sapphire and i think emerald :)
emerald ruby and sapphire
ruby, sapphire, emerald, fire red, leaf green