I really can't believe anyone says that with seriousness.
I mean... come on. There is a fuckton of animals they haven't used yet, not to mention mythological creatures.

If they make a keyring Pokémon it's because they want to, not because they can't think of anything else and are like "Shit, what can I make into a Pokémon so I can get home earlier? Oh, look, keys!"

Most people are just butthurt that trashbag monsters were put in the game instead of some anthro wolf with Dark and Dragon moves.