If you have shiny Eevee and specifically want a shiny Vaporeon... good luck! As per old research by the now-defunct website The Silph Road (via Wayback Machine), the shiny rate for Pokémon on a ...

While both the shiny and normal Eevee will have increased ... Greengrass Isle, for example, will feature a larger number of Vaporeon, Jolteon, Flareon, Espeon, Umbreon, Leafeon, Glaceon, and ...