Born from a sand mound playfully built by a child, this Pokémon embodies the grudges of the departed.
– Pokémon Sun Pokédex
Sandygast is such a silly concept, I loved it when I first saw it. Though its Pokedex entry is rather creepy.
I used a Sandygast on my first run of Sun. I like how it learns Absorb/Mega Drain/Giga Drain which helps it heal. It’s dead slow (so I gave it the Quick Claw to hold) but pretty bulky. Its typing gives it 3 immunities, which is helpful.
Its ability Water Compaction is unique to its family; it raises Def by 2 stage when hit by a Water type move. However, since it’s weak to Water I generally didn’t use it against Water types (though Giga Drain helps). I think its ability came in handy only a couple of times.