It's Satoshi's first time in the Alola region for quite a while, and Go's first time there ever! But even though Satoshi got to reunite with everyone from the Pokémon School, Go was the one that got challenged by Kaki!!
Satoshi and Go have come to the Alola region! Satoshi goes around reuniting with Professor Kukui, the students from the Pokémon School he used to attend, as well as his Pokémon. But since this is Go's first time meeting them all, he's a bit nervous, and during the welcoming party that's held for the two at the Pokémon School, Satoshi's classmate Kaki challenges him to a battle, saying he'll "make sure this guy is a fitting rival for Satoshi"! Go accepts the challenge!!