There are special fun things you can do with your Pikachu. That's part of what makes Yellow an interesting game to play! Here are the following and descriptions to the activities:

Fishing Pikachu: When you go fishing as your character, catch or run away from the water Pokemon. Turn around and talk to Pikachu and Pikachu will think of fishing and will be hiding under a bucket.

Dancing Pikachu: Do you know those cliffs that you can jump over? When you first take your leap, Pikachu will be stuck behind if you don't move. Leave Pikachu there for a while and you can watch it tqist and dance!

Surfing Pikachu: Everybody has heard about it because it's Surfing Pikachu! There's was a contest held for 100 Pokemon Trainers to recieve a Pikachu with the Hm move Surf. You can also earn a Surfing Pikachu by going to the Stadium 1 Cheats. Once you have your Pikachu, try and surf on the water. You can see Pikachu Surfing instead of the old surfing character! There is also a Mini-Game you can play in the south of Fushia City if you talk to the man with a Pikachu. More information is at the Surfing Pikachu section.

Shocking Pikachu!: Once Pikachu has learned an Electric move like Thunder Wave or Thunderbolt, talk to your Pikachu after. Pikachu will be pumped with energy and shock you!