Question

I know ground, rock, and steel types are unaffected by damage with Sandstorm. However, Cacturne and Cacnea are also unaffected by damage with Sandstorm. Are any other Pokemon not damaged by Sandstorm?

Comments

Ground,Steel,and Rock
and pokemon with the overcoat ability

Answer 1

Ground, Rock and Steel - types
and
??Sand Veil and Sand Stream abilities??

Comments

Overcoat, Magic Bounce, Magic Bounce, Sand Rush

Answer 2

Ground, rock and steel types like you said.
Pokemon with the abilities:

sand force: http://pokemondb.net/ability/sand-force

sand veil: http://pokemondb.net/ability/sand-veil

sand rush: http://pokemondb.net/ability/sand-rush

and sand stream: http://pokemondb.net/ability/sand-stream