>>55779484GF is highly inconsistent whit this shit
>Diancie is a mutated Carbink but is classified as a legendary pokemon by in-universe "professors">G-Artcuno, G-Zapdos and G-Moltres are recognized in-universe as different species but they just said, "fuck it, its friday night, and am not being paid enough, these fuckers look like these other ones so they're regionals, end of the story">also in Galar you have the Fossils, 4 completely new species that are the result or an idiot who mixed the bones of different species (like it happened in our world a century ago)>Then Bloomoon just like Diancie is a mutated version of an existing species but in-universe is just another form because reasonsThe fossils in general are said to be different as how they actually used to look in prehistoric times, just looking like the do now due inaccurate resurrection methods.
And like the anon before me said, there's Eternal Floette that, just like Entei/Raikou/Suicune was resurrected and just like the Beasts its body showed several changes but nope, same species, different form.