Blue Version! I thought the blue cartridge was the coolest thing! tried silver for a week and lost interest, then years later I got it in an emulator and loved it. then last year when I got laid off from work my friend got diamond for me to cheer me up and platinum for himself so we could play together, little did we know the servers shut down for those so we couldn't actually battle/trade. then when my girlfriend broke up with me she took her DS back so I bought a 3DS and got Omega Ruby! and now I'm obsessed again!
Little did I know that little blue cartridge would end up creating such an addiction for me all these years later.