Spolier alert! The hidden info may spoil your fun of playing.
After winning the tournament Noah gets a Friendship doll and evolves Pichu into a Pikachu. Noah is now 10 years old and begins to explore the world just like his father did. Soon he finds himself on Route 116 and decides to train. This is the first level of Chapter 2 and it is home to many Pokemon.
If you bring Pichu in your team and play this level, Pichu will instantly evolve into Pikachu.