Installing game updates usually involves extracting the update files (if they're compressed) and then following specific instructions for your device (in this case, the Nintendo Switch). Updates can be installed via the Nintendo eShop, or through a PC and a USB connection to your Switch, using tools designed for homebrew or game modding communities.

Serebii.net is the gold standard for checking encounter rates, item locations, and movepools.

Note: A paid Nintendo Switch Online membership is required for this feature.