What would be the optimal Eeveelution for my shiny Eevee’s stats?

I just found two in Brilliant Diamond! I want them to be their best selves, so I just want to know what would be best for them considering their stats and natures.

Eevee - MaleAbility: Run AwayNature: Impish

Hp: pretty goodAttack: decentDefence: fantasticSp. Atk: decentSp. Def: very goodSpeed: best

Eevee - MaleAbility: adaptabilityNature: Sassy

Hp: pretty goodAttack: pretty goodDefence: pretty goodSp. Atk: decentSp. Def: very goodSpeed: no good

Thanks in advance!

And before sumwun asks, I want them to be competitive-based, but for in-game. Basically I just want them to be neat

Both have 0 EV but I plan on EV training them after evolution.

Pleaselog inorregisterto add a comment.

An Impish Nature raises Defense and lowers Special Attack. Because your Impish Run Away Eevee has good IVs in all defensive stats, try making it aVaporeon. Vaporeon is a great tank, and while Special Attack is helpful for one, it isn’t necessary – Wish + Protect is still viable.

Vaporeon @ LeftoversAbility: Water AbsorbEVs: 252 HP / 252 Def or SpD / 4 SpAImpish Nature- Wish- Protect- Scald- Shadow Ball / Yawn / Charm

A Sassy Nature raises Special Defense and lowers Speed. The most specially bulky Eeveelution isSylveon, which can function as an effective special wall with its IVs and a Sassy Nature. It also doesn’t exist in these games (ILCA why), so try either another Vaporeon, orGlaceon, which can do with a bit of extra bulk.

Glaceon @ LeftoversAbility: Snow CloakEVs: 252 SpA / 252 SpD / 4 HPSassy Nature- Freeze-Dry / Ice Beam- Shadow Ball- Wish- Protect

Congrats on the shinies!