In the game Legends Arceus, the Legend Plate was a plate that would keep Arceus looking like a normal type. However, when he goes up against a pokemon, Judgement automatically turns into the super effective move that would hit that pokemon, plus changing Arceus's type during that attack, adding STAB. For instance, he starts as normal with the plate. He goes up against Empoleon, the legend plate turns him into Electric Arceus when he uses Judgement and the move becomes super effective. There are Youtube videos showing how it works in the actual game.
In the game Legends Arceus, the Legend Plate was a plate that would keep Arceus looking like a normal type. However, when he goes up against a pokemon, Judgement automatically turns into the super effective move that would hit that pokemon, plus changing Arceus's type during that attack, adding STAB. For instance, he starts as normal with the plate. He goes up against Empoleon, the legend plate turns him into Electric Arceus when he uses Judgement and the move becomes super effective. There are Youtube videos showing how it works in the actual game.