If you don't know, Nightmare Fuel is something not intended to be scary, but ends up being so anyway. Look it up on TV Tropes. Anyways, here, just talk about the stuff in Pokemon that could scare/scares you.
I found one in PF: Miaundead. No, not how it sucks away life, but something never said outright, but can be deduced. You see, since you can only get by breeding a female Mummeow/evolutions without the Egypt Amulet thing, you would think it would be a birth defect that forces them to suck life. But, zombies are most commonly thought to be the same as undead, and Miaundead even has undead in it's name. So this means that it died before birth, and has to suck energy from whatever is around it to survive. This means that it's mother is gradually dying from it's own dead young. .___________.
I found one in PF: Miaundead. No, not how it sucks away life, but something never said outright, but can be deduced. You see, since you can only get by breeding a female Mummeow/evolutions without the Egypt Amulet thing, you would think it would be a birth defect that forces them to suck life. But, zombies are most commonly thought to be the same as undead, and Miaundead even has undead in it's name. So this means that it died before birth, and has to suck energy from whatever is around it to survive. This means that it's mother is gradually dying from it's own dead young. .___________.
