Sandaconda's elastic neck pouch can store over 220 pounds of sand, tough enough to resist a Durant's pincers, and it contracts its coiled body to blast that sand through its nose with tremendous force, sometimes mixing in saliva to form sharp gravel. Bulbapedia notes Sandaconda is the only Ground type known to have a Gigantamax form, in which it rears up on its tail like a cobra, its coiled body shaped like a tornado while sand pours from its pouch and swirls around it.
Sandaconda debuted in Chasing to the Finish!, under the ownership of a character named Lyla, who used it alongside Sterling's Runerigus in a battle before it was defeated by Blastoise and Cinderace.
Sandaconda debuted in Sword & Shield with two printings, a Rare by Kouki Saitou and a Holo Rare by nagimiso. Rebel Clash printed Sandaconda V, Chilling Reign added more V cards plus a Holo Rare and a Secret Rare VMAX, and Journey Together added a Hop's Sandaconda printing illustrated by Sanosuke Sakuma.
Sandaconda's first card, a 2020 Sword & Shield Rare illustrated by Kouki Saitou.
A Secret Rare Sandaconda VMAX from Chilling Reign illustrated by aky CG Works.
A Hop's Sandaconda from Journey Together illustrated by Sanosuke Sakuma.
Sandaconda evolves from Silicobra at level 36.
Yes, Sandaconda is the only Ground-type Pokémon known to have a Gigantamax form.
Yes, Chilling Reign printed both a Holo Rare and a Secret Rare Sandaconda VMAX.

サダイジャ
Ground
Sandaconda is the Sand Snake Pokémon, a ground type that uses an inflatable neck pouch to store and blast sand at foes. It evolves from Silicobra at level 36 and has a Gigantamax form, the only Ground type known to have one, and our catalog lists 14 Sandaconda cards across 9 sets.
SilicobraSandaconda
No published index yet — too few of Sandaconda’s cards trade often enough to strike one.