I have a few good ones, namely some for shinies.
I have a shiny Meowscarada from GO (gee, getting multiples of shinies in GO, what a concept) that I opted to name Nepeta, the scientific name for cat mint. I feel it suits her perfectly.
I also have a shiny Gardevoir, an alpha no less, that I called Dizzy, a character from Guilty Gear. Dizzy (the character, not the Gardevoir) has a blue/black colour scheme primarily, which fits Mega Gardevoir to a T. Now if only Pokemon weren't locked into Z-A when transferred...
Lastly, for now, the shiny Tinkaton with the Intense mark who I named Sena, after a character in Xenoblade Chronicles 3 who also happens to be a smol girl with a huge hammer. Sena the Feisty, brilliant.