The group come into a forest where it is quiet and peaceful. They notice a large group of Pikachu that Ash's Pikachu tries to make friends with. Ash scares them off, but Pikachu is later accepted when it dives to save a young Pikachu that was washing away down the waterfall. Ash starts to miss Pikachu as they hear a noise. Team Rocket successfully get all of the Pikachu in a net. Ash's Pikachu is the hero again as it chews a hole in the net and Ash and the group use the net they were caught in as something for the Pikachu to jump onto. Ash decides to leave Pikachu behind, but Pikachu doesn't want to. Ash refuses to keep Pikachu many times, but Pikachu persists until Ash realizes how much Pikachu likes him. He then let's Pikachu stay with him. (thetvdb.com)