Dsi question plzpzlpzlpzlpzlpzpzlpzlpzl help me?

ok i was gona buy dsi its out in 3 weecks but i realy want to playe pokemon man its out in 10 days thets 2 weecks befor dsi cant wait amm what did they mean dsi haves spechial ds games like what can the dsi use action replaye plz anwser me now