"Dratini continually molts and sloughs off its old skin. It does so because the life energy within its body steadily builds to reach uncontrollable levels."
Dratini is a very curious Pokemon, because it's actually the beginning of the entire Dragon-Type breed of Pokemon. No, seriously, there are only three Dragon-types in all of Gen I, and Dratini is the start of it all. To that end, a lot of players have wanted Dratini just so they could raise it to be the ultimate Dragon-Type.
Dratini's Basic Attack is Dragon Breath, while its Special Attacks are Wrap, Twister, and Aqua Tail.