Poliwag has a black and white swirl on its abdomen, which are actually its internal organs showing through its semitransparent skin. The swirl looks clearer after it eats, and the skin is very elastic so that it will not break if the Pokémon is bitten. The direction of the belly spiral differs by area, with the equator being thought to have an effect on this.
Birdperson asks if Morty knows what "wubba lubba dub dub" means, and Morty says it's just Rick's dumb catchphrase. Birdperson reveals that in his native tongue, it actually means "I am in great pain, please help me." Morty says that Rick isn't really that deep, and is just saying it ironically, but Birdperson tells him that Rick really is in great pain, and needs Morty there with him.
Its body is a black robe with two bones on its back. It has a mask that resembles a skull and has single eye that floats between the eye sockets.
Duskull is primarily a nocturnal Pokémon and has been shown to live in thick forests. It is said that this Pokémon will spirit away disobedient children, and it has been described to enjoy the crying of children. Once Duskull chooses a target, it will doggedly pursue the intended victim until the break of dawn.
Enochian is the language that originated from angels. Aside from its use for communication, enochian is used for various spellwork and rituals.
The angel banishing sigil, once drawn in human or angel blood and a hand pressed at its center, sends out a fierce light that banishes any angels within its blast radius. This sigil does no harm to the angels, it merely sends them to a different location on earth, their vessels included.