Atra du evarinya ono varda.
I've heard of other creepy/weird Pokedex entries. Here are some:
This is one of the creepy entries of pokemon that like hurting children.
Duskull: "It loves the crying of children. It startles bad kids by passing through walls and making them cry." (Platinum)
It loves the Crying of Children. Come on, why would they put so much hate on children in a children's video game? O.O There are more such as Drifloon and Hypno (child kidnappers) and Banette, perhaps you could check them out if you want.
This one is about a pokemon mourning over its own Death.
Yamask: "Each of them carries a mask that used to be its face when it was human. Sometimes they look at it and cry." (Black) D:
Gorebyss (an enourmous swimming mosquito),
Shedninja (steals your spirit when you peer into the hole in its back (which you do EVERY time you send it out into battle)),
Cacturne (follows people at night and waits for them to tire out. why? what will they do to those people? kill them?? eat them??)