I've said this before, but out of all 802 Pocket Monsters, I feel only 2, Eelektross and Hydreigon, are truly worthy of being called monsters.
From the way the dex talks about them, they're beasts with no remorse. They have no empathy. They don't form relationships. They don't hesitate to kill. They have a one-track mind, and their only concern, the only thing they want in life is to find you and devour you.
They are ruthless monsters. They actually scare me a little. I do not like the mental image of sucker-mouth over here ambushing me on the beach, paralyzing me and dragging me into the ocean.