Now this isn't really a creepypasta. Its a little page talking about the creepy sh*t about Pokemon. Some are glitches, and so far as I read making you think about the attacks. Like the attack bite?You know how it's giant teeth clamping down on your enemy's Pokemon?Yeah, Imagine being that Pokemon and shark teethe clamping down on you making you bleed.o-o
Or the attack Gear(or gears)? Two giant 50 pound gears crushing the Pokemon.
Eh, read if you want, I've only read a bit so I can't say if it's good or not. It's just interesting.^^

http://tvtropes.org/pmwiki/pmwiki.php/NightmareFuel/Ptitlei015gc004kw4