>>12119208If you read eevee dex entry they just show you the new method to evolve it in the gen.
Red/blue: Its genetic code is irregular. It may mutate if it is exposed to radiation from element stones.
Silver: Its irregularly configured DNA is affected by its surroundings. It evolves if its environment changes.(day/night)
Emerald: An Eevee has an unstable genetic makeup that suddenly mutates due to its environment. Radiation from various stones causes this Pokémon to evolve. (mix of gen 1 and gen 2)
Diamond/Pearl: A rare Pokémon that adapts to harsh environments by taking on different evolutionary forms. (The location based evolution)
Black/White :Because its genetic makeup is irregular, it quickly changes its form due to a variety of causes.( A mix of all the other gen)
and like
>>12119287 said nothing it say about changing type
