What are the best natures for each of the eeveelutions for competitive use?
Sylveon:
Glaceon:
Vaporeon:
Leafeon:
Flareon:
Jolteon:
Espeon:
Umbreon:
I'd prefer if you had just one best nature, but I'd like to keep the max to two best natures.
I'll be breeding a different kind of eevee for each evolution.
Hopefully someone could help me out.
Sylveon: Modest or Bold;
Glaceon: Modest;
Vaporeon: Bold;
Leafeon: Jolly or Impish;
Flareon: Adamant;
Jolteon: Timid;
Espeon: Timid;
Umbreon: Calm or Bold;
Sylveon usually plays an offensive role with a Modest nature, but a Cleric set can also be ran, in which case a Bold nature is preferred for increased bulk.
As for
Glaceon, an offensive set with a Modest nature is preferred; that's because, despite its high Defense stat, its typing is arguably the worst defensively, but one of the best offensively.
Vaporeon works best as a Cleric, by passing huge Wishes to its teammates thanks to its 130 HP stat; for this reason, it should run a Bold nature to increase its low defense and keep it alive for longer.
Leafeon should run a Jolly nature to take advantage of its 95 Speed stat (although pretty average) and its access to Chlorophyll; you can run an Impish nature if you want to run a support set though.
Flareon prefers running an offensive set with an Adamant nature to make use of its 130 base Attack.
Espeon and
Jolteon should both run a Timid nature because their Speed stats are one of their best qualities, and they're too frail to run a defensive set.
As for
Umbreon, you can either run a Calm or a Bold nature for a specially or a physically defensive set, respectively, although as far as I know Calm is more used.
Also, as a side note before you start breeding, remember that Wish (used by basically all of the defensive/support sets) is an
Egg Move, while Baton Pass (also used by some sets) is only learned by Eevee at lv. 33.