How to master moves in Pokémon Legends: Arceus
The entire battle system in Pokémon Legends: Arceus was overhauled to create something entirely new for the Pokémon franchise, and that applies to the way moves function over the course of the game. This includes the introduction of mastering a move.
Each move doesn’t require its own means of leveling up but rather the moves you use most often will level up alongside your Pokémon. When a Pokémon levels up in Legends: Arceus, the set of moves that it has equipped at the time will also level up.