Winotinger is the only Pokémon in the game whose catch rate is actually higher than its prior evolutionary form, despite Winotinger not possible to catch in the wild.
No other Pokémon has the same type combination as Winotinger and Jackdeary.
Winotinger is based on the mythical animal called a Wolpertinger, which is made using taxidermy to attach claws, fangs, wings, etc. to the body of a rabbit.
Winotinger is almost certainly inspired by the 1950 movie Harvey, in which a man with a propensity to drink has an invisible 6' 3" rabbit or "pooka" that only he can see as his best friend. It could also be based on the Ometochtli from Aztec mythology, which could explain its alcoholic theme as well as the location of the region.
Winotinger comes from wino (a term for an alcoholic) and wolpertinger.