It is not known to evolve into or from any other Pokémon.
It is one of the Ultra Beasts and is known by the code name UB-05 Glutton (Japanese: ＵＢ０５ Ｇｌｕｔｔｏｎｙ).
Guzzlord is a large, dangerous Pokémon and is one of the Ultra Beasts. It has a large mouth right at the center of its belly, with several sharp fangs on the top and bottom jaw. Its insides are blue and within is a black tongue, along with several spikes. It has a small opening to the rest of its innards. It has two small arms located on the top of its head and has three digits with yellow claws. What appear to be a pair of large pincers are in fact extensions of its tongue, used to grab and consume anything or anyone nearby. Two small openings at the ends of its mouth allow these tongue-pincers to remain extended even when its mouth is closed.
It has a pair of thick legs that have a yellow zigzag pattern on its knees. It has several wing-like protrusions around its body, with a tail which resembles a medieval mace. It has blue eyes. On the top of its head appears to be a smaller head, which also has blue eyes, with several yellow tipped spikes. In order to eat, Guzzlord's tongue moves in a wave-like motion that pulls food towards its mouth. Its texture is said to feel like hard rubber. According to reports, this Pokémon has gobbled up mountains and swallowed buildings whole and will eat absolutely anything else it can reach, including the very land and sea. Although it constantly eats, its droppings have never been found. It is speculated that the entirety of the matter it consumes is converted into energy, with no waste products left over. Guzzlord originates from the Ultra Ruin dimension in Ultra Space, where its population is said to be declining.
Due to its habit of eating almost anything but not excreting anything out, Guzzlord may be based off a black hole, and also possibly a personification of gluttony. Additionally, it resembles a crab. The general shape is of an European dragon, while the spiny, mace-shaped tail is similar to prehistoric creatures such as the Ankylosaurus and Glyptodon.
Guzzlord may be a combination of guzzle (to eat or drink in a greedy manner) and lord.
Akuziking may be a combination of 悪食 akujiki (consumption of repulsive things), 悪 aku (evil), and king.