Nao's Pikachu is a Pikachu that was owned by a young boy named
Nao. This Pikachu was different than the rest of the Pikachu in the traveling group tour: shy, not energetic, and a very quiet voice.
Haru and
Haru's Psyduck tried to work together to "make Pikachu louder", but ultimately learned that Pikachu was great just the way they are.