Eevee (Hidden Fates HIF 48)

Eevee — 60 HP — [C]
Basic

[C] Curiosity
Your opponent reveals their hand.

[C][C] Spin Tackle: 30
Flip a coin. If tails, this Pokémon does 10 damage to itself.

weakness: [F]×2
resistance:
retreat: 1

Illus. Kagemaru Himeno
Hidden Fates — 48/68 — Rare Holo

The question of why only Eevee has such unstable genes has still not been solved.