Puka

In episode 67, a pikachu with blue eyes was revealed. This pikachu was the Surfing Pikachu. It was only mentioned or seen in episode 67, and never seemed to get any fan recognition after the episode.

The surfing pikachu, Puka, was owned by Victor, a surfer. Victor had rescued Puka from the sea, and had taken him in.

Events
There have been several special events where Nintendo has given the public chances to obtain their very own surfing pikachu. The most recent events occurred in 2008; however, there is a way to obtain one in Pokemon Battle Revolution. After defeating Mysterial, you can download the pikachu to Diamond and Pearl. This can be traded to Platinum.