What is the purpose of Pokemon shield?

What is the purpose of Pokemon shield? The main objective of the games is to dethrone the Pokémon League Champion, Leon, in a tournament that various other Gym Leaders and rivals also take part in, whilst dealing with Team Yell and a nefarious conspiracy within the League.

The main objective of the games is to dethrone the Pokémon League Champion, Leon, in a tournament that various other Gym Leaders and rivals also take part in, whilst dealing with Team Yell and a nefarious conspiracy within the League.