Pokémon Ultimate Journeys

The group come into a forest where it is quiet and peaceful. They notice a large group of Pikachu that Satoshi's Pikachu tries to make friends with. After saving a young Pikachu from drowning and rescuing the herd from the Rocket-Dan, Satoshi's Pikachu is welcomed among the other Pikachu as one of their own. Saddened by this sudden distance, Satoshi tries to leave Pikachu behind (to Kasumi and Takeshi's shock and dismay), thinking that in the long run, it is going to be better off with its own kind. As they attempt to leave the forest with Satohshi still standing his ground on leaving Pikachu.