>>28668860Gen 1: 4 eevees (Eevee, Flareon, Vaporeon, Jolteon)
Gen 2: 2 eevees (Umbreon, Espeon)
Gen 3: 0 eevees
Gen 4: 2 eevees (Glaceon, Leafeon)
Gen 5: 0 eevees
Gen 6: 1 eevee (Sylveon)
4, 2, 0, 2, 0, 1 follows the pattern of digits of sine(20 degrees) starting with the hundredths place, so we're clearly getting 4 Eevees in Gen 7, then 3 in Gen 8, 3 in Gen 9, and so on.