Defensa Hoja (Leaf Guard)

Introduced in Generation IV, Leaf Guard provides complete immunity to all major status conditions -- burn, freeze, paralysis, poison, and sleep -- while strong sunlight is active on the field (from Sunny Day or Drought). When sunlight fades, the protection ends and the Pokemon becomes vulnerable to status moves once again.

Rest will fail entirely when Leaf Guard is active during sun, as the Pokemon simply cannot force itself to sleep. If Yawn is used on a Leaf Guard Pokemon during sunlight, it fails immediately. If Yawn was applied before the sun appeared, it still fails when the drowsiness would take effect. Prior to Generation V, Rest could still be used successfully even during strong sunlight.

Found on 20 Pokemon -- primarily Grass-type like Leafeon, Roserade, and the Fomantis line -- Leaf Guard rewards sun-oriented team compositions with passive status protection across the board.