Shore Up restores the user's current HP based on the weather in the battle. Outside of a sandstorm, it restores ½ total HP; during a sandstorm, it restores ⅔ total HP.
If powered up by a Groundium Z into Z-Shore Up, all of the user's lowered stats are reset.
Pokémon Sword and Shield
In Version 1.0 to 1.1.1 of Pokémon Sword and Shield, Shore Up could not be selected in a battle. Starting with Version 1.2.0, it can be selected and functions as it did in previous generations.
Pokémon Brilliant Diamond and Shining Pearl
Shore Up cannot be selected in a battle.