This Episode has never been publicly shown. The only existence of this episode is a short 36 second preview from the episode prior. Unfortunately, it is in the original Japanese without subtitles.
Reason Episode 377 – Shaking Island Battle! Barboach vs Whiscash is a banned Pokémon episode:
This episode features Whiscash making Earthquakes. It was originally supposed to air on November 4, 2004. However, there was a devastating earthquake in Chūetsu, Japan on October 23, 2004. A decision was reached to not air the episode in consideration of those that lost their lives in the earthquake. This episode was then skipped in line-up and has never been aired in any country.