Really Creepy Guy is the annoying mailman that appears in Super Pokeman 64 bloopers: WELCOME TO POKEMANS! in which he ignores Mario, much to the plumber's irration. Eventually he challenges Mario to a Pokémon battle who refuses. Consequentially the guy turns into a winged demon, forcing Mario to accept. He easily defeats Mario.

He is a reference to the Pokémon trainers found in the video games, who ignore the player at first until he crosses their field of view, forcing them to battle. 

The battle screen

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