The question of why only Eevee has such unstable genes has still not been solved.
Type
Attributes
Expansion
Number
Rarity
Release
Regulation
Formats
Energy Types
Species
HP
Retreat
Weakness
Resistance
Stage
Evolves From
Artist
Search your deck for any number of Eevee and Eevee-GX and put them onto your Bench. Then, shuffle your deck.