You can buy TM37 Sandstorm from the TM Shop located inside the Royal Avenue Pokémon Center. The same shop also sells the TMs for all other weather moves (Hail, Rain Dance and Sunny Day).
Royal Avenue is located on Akala Island. You will be able to access Royal Avenue after completing the Brooklet Hill trial.
Getting TM37 Sandstorm (Step-by-Step)
In the main storyline you will arrive at Royal Avenue from the west. Here’s how to get the TM:
Step 1: After arriving at Royal Avenue, walk east along the main road.
Step 2: Continue walking east until you reach the Pokémon Center, then enter the building.
Step 3: Inside the Pokémon Center, walk to the counter on the right side.
Step 4: Talk to the clerk on the right in order to access the TM Shop and select “Buy”.
Step 5: Select Sandstorm, which is the fourth and final item in the list. The TM costs costs 50,000 PokéDollars.
Sandstorm Details + Use
|Sandstorm Move Details|
Sandstorm is a weather move, and will brew a sandstorm when used in battle.
Sandstorm will last for five turns. A Pokémon holding a Smooth Rock will extend sandstorm to eight turns.
While active, sandstorm will damage all Pokémon in battle for 6.25% of their maximum HP.
Ground, Rock and Steel-type Pokémon are immune to damage from sandstorm. Pokémon with the abilities Magic Guard, Overcoat, Sand Force, Sand Rush and Sand Rush are also immune. Likewise, Pokémon holding Safety Goggles won’t take damage from sandstorm.
While sandstorm is active, Rock-type Pokémon will have their Special Defense boosted by 50%.
In battle, sandstorm has the following move interactions:
- Boosts Shore Up’s recovery to ⅔ of the Pokémon’s maximum HP.
- Decreases the recovery of Moonlight, Morning Sun and Synthesis to 25% of the Pokémon maximum HP.
- Halves the base power of Solar Beam and Solar Power.
Sandstorm will also interact with the following abilities in battle:
- Sand Force will boost the power of Ground, Rock and Steel-type moves by 30%.
- Sand Rush will double the Pokémon’s Speed stat while sandstorm is active.
- Sand Veil will boost the Pokémon’s evasiveness by 80%.
Sandstorm teams are a common weather-based strategy. On the other hand, Sandstorm itself isn’t a very popular move option.
Most sandstorm teams will use a Pokémon with the ability Sand Stream as the primary weather setter.
A Pokémon with Sand Stream will brew a sandstorm immediately after entering the battle. Unlike Sandstorm, Sand Stream doesn’t require a full turn to set up.
That being said, Sandstorm can be a viable option in some cases. Sandstorm teams may choose to run a secondary setter as a backup plan in case the Sand Stream user goes down. In that specific case, the secondary setter will usually have Sandstorm in the moveset.