I found this a long time ago and have yet to try any of these shots based on Eeveelutions.
I think my favourites are:
Eevee:
¼ simple syrup
1 oz Bourbon whiskey
dash Angostura bitters
dash Orange bitters
Glaceon:
¾ oz Irish cream
¾ oz Ice 101 peppermint schnapps
Pokémon related: How to make MooMoo Milk and Bear Walker’s Pokémon-themed skateboards