Upon arriving in Pikachu Valley for the first time, Pokémon Ultra Sun and Ultra Moon players will be greeted and given an exclusive Pikachu-themed frame to use in the Alola Photo Club. You can interact and play with all the Pikachu there. On the east side of the valley behind the van is a Magnet. On the west side of the valley is a guide who will ask if you want to try the Pikachu professor quiz. If you answer all of her questions right, you’ll be rewarded with a Pikachu shirt and Pikachu cap. To watch more than three minutes of gameplay footage from Pikachu Valley, check out the IGN video below:
We make a stop in the relaxing Pikachu Valley to make some new Pikachu friends and find some cool Pikachu themed clothes!
Source: IGN Wiki Guide