Apparently these are a thing with kids in Mexico, they're like Pokemon cards I guess, they "battle" with them (pic from Google, not mine). : r/funkopop
Shiny Mewtwo custom Funko Pokémon Pop Vinyl - Etsy
Diamond Eevee Funko POP! Games Pokémon 2021 Fall Limited Edition Exclusive #626 | eBay
Shiny Charizard custom Funko Pokémon Pop Vinyl W/ Chance of Chase - Etsy