First off, Sand offence Sandslash shouldn't be ran with a Choice Band. If the opponent scouts that you're choiced, they can simply switch into something that resists or is immune to the attack you are going to use, forcing you to switch, wasting a turn of Sand Stream.
What you need to do is shiny hunt for an Adamant/Jolly Sandslash with this set up
Sandslash @ Life Orb / Earth Plate
Ability: Sand Rush
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Swords Dance
- Earthquake
- Stone Edge / Rock Slide
- X-Scissor / Knock Off
Swords Dance allows Sandslash to break through more walls with its three moves. Earthquake for STAB, Stone Edge to hit Flying and Bug types for super effective since they resist or are immune to Earthquake and X-Scissor is for hitting Grass, Psychic and Dark types, however, Knock Off may be more useful for it nails Ghost types such as Rotom and Mismagius and also hits Levitate Pokemon.
Though I recommend using Life Orb, Earth Plate is good for bluffing that you are choiced into an attack if you never previously Swords Danced
Jolly Nature allows Sandslash to outspeed a Shell Smash boosted Omastar, a Lilligant after 1 Quiver Dance, (scarfed Rotom, Primeape, Jynx, Garchomp, Landorus, Hydreigon, Staraptor, Victini, and Haunter), Dragon Dance Charizard X after one boost, M-Sharpedo after one speed boost and Ninjask before Speed Boost kicks in. The Adamant nature does not achieve these benchmarks
What you need to do is shiny hunt for an Adamant/Jolly Sandslash with this set up
Sandslash @ Life Orb / Earth Plate
Ability: Sand Rush
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Swords Dance
- Earthquake
- Stone Edge / Rock Slide
- X-Scissor / Knock Off
Swords Dance allows Sandslash to break through more walls with its three moves. Earthquake for STAB, Stone Edge to hit Flying and Bug types for super effective since they resist or are immune to Earthquake and X-Scissor is for hitting Grass, Psychic and Dark types, however, Knock Off may be more useful for it nails Ghost types such as Rotom and Mismagius and also hits Levitate Pokemon.
Though I recommend using Life Orb, Earth Plate is good for bluffing that you are choiced into an attack if you never previously Swords Danced
Jolly Nature allows Sandslash to outspeed a Shell Smash boosted Omastar, a Lilligant after 1 Quiver Dance, (scarfed Rotom, Primeape, Jynx, Garchomp, Landorus, Hydreigon, Staraptor, Victini, and Haunter), Dragon Dance Charizard X after one boost, M-Sharpedo after one speed boost and Ninjask before Speed Boost kicks in. The Adamant nature does not achieve these benchmarks
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