Thinking about it more, the Greek deities all had sacred animals, and funnily enough Hera’s were the cow and the peacock. Miltank would be a hilarious addition, but if everything’s from scratch I know that won’t work. A Normal/Flying peacock Fakemon would be cool, just give it something like Color Change/Protean/Prism Guard or something to fit flavor wise. Another animal native to Greece is the chamois, a kind of antelope/ram looking thing, and the Eurasian otter.
Edit: even better idea for the peacock’s ability. Make it so that it takes reduced damage from any non-Normal attacks or something. I doubt a Fakemon based on a peacock would be very bulky, but it’d be cool at least in theory.