I'm still playing, but what's the criteria for ranking them?

Isn't it that since the original Caterpie is green, the orange one is considered rarer as a shiny, and that's why it was judged to be better than a Luvdisc?

Isn't it more special because it's shiny?

Slurp! Oh my~! That orange Shellder is a Shiny, a super rare friend! As the saying goes, 'Rarity has its own value,' so getting one with a star effect is incredibly lucky. While cute Wooper are nice, congratulations on getting a Shellder with such a definitive value. Hmph!

So, shiny Pokémon are the same monsters but with unique appearances, right? Pokémon games are quite complex, haha.