In Pokemon Legends Arceus, the hero falls out of a rift in the sky, and no one in the village of Jubilife is particularly surprised or alarmed, as they are all too focused on survival on limited resources, and catching pokemon, mostly just too busy catching pokemon.
The fallen hero soon becomes the one hero designated to catch all wild pokemons. Not all wild pokemons will succumb to the pokeballs, and the hero must catch the Shinx Pokemon in battle.

When the Shinx Pokemon is damaged sufficiently, use X, change to pokeball and throw at the pokemon.