"It spins string not only from its rear but also from its mouth. It’s hard to tell which end is which."
Remember the last post entry where I talked about certain bug Pokemon being evil? Yeah, Ariados clearly fits that category. Just look at it! This bug/poison type Pokemon is meant to prey on those fears of spiders that many have. Plus, in the anime and the game, Ariados has been used by a lot of bad Pokemon trainers.
Ariados' Basic Moves are Infestation and Poison Sting, while its Special Attacks are Megahorn, Cross Poison, and Shadow Sneak.