More seriously, there are not just references but several mentions of real world animals and places in the anime and games in the first decade of pokémon. However, those disappeared as the pokémons transited from "strange monsters" to "usual wildlife" in the game and anime universe.
, pure ugly fat cat.
Probably one of the hardest pokémon to get in mainline games outside legendaries and fabulous pokémons, as it (and its pre-evolution ) only appears in Pearl and on mirage islands of Omega Ruby / Alpha Sapphire.
also appeared in the discontinued Dream World and in an event of White2.