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The starters are all based on alchemic elements necessary to create the Philosopher's Stone, something meant to grant immortality and maybe even rival god
Or in this case Type:Null, which in it's entry already notes that it's constructed from a combination of pokemon and states that it was created to rival pokemon spoken of in mythology (likely to be Arceus)
Anatomically it also has a blue tailfin (Popplio), green talons (Roothoot) and the mask having what looks to be cat ears (Littlen).
The base of the body would likely be Rockruff, as it's fairly doglike. Referencing the fact that in alchemy the Philosopher's Stone needs Lead as a base as well, Rockruff's supposed element.
