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>UBs seems to be based on planets (just like the Sun and the Moon were considered planets in the past even if aren't planets anymore just like Solgaleo and Lunala are UBs adapted to our world) and Guzzlord is Pluto, the planet furthest from the Earth (Zygarde) which was considered the center of the solar system in the past
>Zygarde is life, order and the natural evolution, Pluto represent death, chaos, the forced change. At the same time, Zygarde's power (nature energy) is pretty similar to atomic energy, green, powerfull, hidden in the depth of earth, may cause weird evolution or the mutation known as megaevolution (remember ORAS when the nature energy which Groudon and Kyogre use to go to their primal forms created new megastones in Hoenn?), and Pluto also represent the atomic power, that's why the inside of Guzzlord's mouth have that pattern similar to configuration of an atom, representing the atomic power
>Guzzlord and Zygarde are both big draconid monsters
>both Dragon type
>both have great HP stats
>both have a big mouth in the chest
>both are in a similar cave, one in Terminus Cave in Kalos, the other one in Resolution cave in Alola (also its japanese name is End Cave, an obvious paralelism to "terminus")