Generation Iii
Sand Veil
Ups evasion in a sandstorm.
Detailed Effect
During a sandstorm, this Pokémon has 1.25× its evasion, and it does not take sandstorm damage regardless of type. The evasion bonus does not count as a stat modifier. Overworld: If the lead Pokémon has this ability, the wild encounter rate is halved in a sandstorm.
Pokémon With Sand Veil
30 canonical Pokémon forms can have this Ability.

Sandshrew 
Sandslash
Diglett
Dugtrio
Gligar
Cacnea
Cacturne
Gible
Gabite
Garchomp
Gliscor
Helioptile 
Heliolisk
Alolan Diglett
Alolan Dugtrio
Geodude
Graveler
Golem
Phanpy
Donphan
Larvitar
Stunfisk
Sandygast
Palossand
Silicobra
Sandaconda
Wiglett 
Wugtrio
Orthworm
Sandaconda Gmax