Ok, fuck. This could be a few things:
A) Graphical glitch. Kinda like what
>>14752568 said.
B) Different shiny colors. It would explain why Masuda's Gogoat was supposedly Shiny, but the shiny Gogoat a guy found is actually white/brown/gold. Also, we saw a shiny skrelp before the game was released, it was reddish or pink or whatever, but iirc I saw an XY shiny chart made with sprites and it has a black skrelp or something like that.
B) Es fake.