| Black | Because its genetic makeup is irregular, it quickly changes its form due to a variety of causes. |
| White | Because its genetic makeup is irregular, it quickly changes its form due to a variety of causes. |
| 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 composition of its body to suit its surrounding enviÂronment. |
| Silver | Its irregularly configured DNA is affected by its surroundings. It evolves if its environment changes. |
| Crystal | Its ability to evolve into many forms allows it to adapt smoothly and perfectly to any environment. |
| Ruby | 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. |
| 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. |
| Fire Red | An extremely rare POKéMON that may evolve in a number of different ways depending on stimuli. |
| Leaf Green | Its genetic code is irregular. It may mutate if it is exposed to radiation from element STONES. |
| Diamond | A rare Pokémon that adapts to harsh environments by taking on different evolutionary forms. |
| Pearl | A rare Pokémon that adapts to harsh environments by taking on different evolutionary forms. |
| Platinum | Because its genetic makeup is irregular, it quickly changes its form due to a variety of causes. |
| Heart Gold | It has the ability to alter the composition of its body to suit its surrounding environment. |
| Soul Silver | Its irregularly configured DNA is affected by its surroundings. It evolves if its environment changes. |