Eevee

Red / Blue: Its genetic code is irregular. It may mutate if it is exposed to radiation from element STONEs.

Yellow: Its genetic code is unstable, so it could evolve in a variety of ways. There are only a few alive.

Gold: It has the ability to alter the com­ position of its body to suit its surrounding envi­ ronment.

Silver: Its irregularly configured DNA is affected by its surroundings. It evolves if its en­ vironment changes.

Crystal: Its ability to evolve into many forms allows it to adapt smoothly and perfectly to any environment.

Ruby / Sapphire: EEVEE has an unstable genetic makeup that suddenly mutates due to the environment in which it lives. Radiation from various STONES causes this POKéMON to evolve.

Emerald: An EEVEE has an unstable genetic makeup that suddenly mutates due to its environment. Radiation from various STONES causes this POKéMON to evolve.

FireRed: An extremely rare POKéMON that may evolve in a number of different ways depending on stimuli.

LeafGreen: Its genetic code is irregular. It may mutate if it is exposed to radiation from element STONES.

Diamond +2: A rare Pokémon that adapts to harsh environments by taking on different evolutionary forms.

Platinum +2: Because its genetic makeup is irregular, it quickly changes its form due to a variety of causes.

HeartGold / Sword: It has the ability to alter the composition of its body to suit its surrounding environment.

SoulSilver: Its irregularly configured DNA is affected by its surroundings. It evolves if its environment changes.

Black 2 +3: Thanks to its unstable genetic makeup, this special Pokémon conceals many different possible evolutions.

Omega Ruby / Alpha Sapphire: Eevee has an unstable genetic makeup that suddenly mutates due to the environment in which it lives. Radiation from various stones causes this Pokémon to evolve.

Sun: Possessing an unbalanced and unstable genetic makeup, it conceals many possible evolutions.

Moon: Current studies show it can evolve into an incredible eight different species of Pokémon.

Ultra Sun: The question of why only Eevee has such unstable genes has still not been solved.

Ultra Moon: Its genes are easily influenced by its surroundings. Even its face starts to look like that of its Trainer.

Let's Go Pikachu / Let's Go Eevee: It can evolve into a variety of forms. Eevee’s genes are the key to solving the mysteries of Pokémon evolution.

Legends: Arceus: Harbors the potential to evolve into manifold forms. Within Eevee lies the key to the mysteries of Pokémon evolution—I'm certain of it.