DS has been wanting a Nintendo DS for some time now. He only wants to play Pokemon games with his cousins online. Fortunately one of his older cousins is going to give him her old (pink )2DS. I am able to find some Pokemon DS games that are around $40 online. That's expensive but still a lot cheaper than buying the newer 3DS. I am afraid of buying a game that will only play on the newer 3DS version- how can I tell if it will be compatible with the 2DS? I am not familiar with Nintendo at all and wondering if it's worth investing into an 'old' system.