Pokemon: Bokutachi Pichu Brothers - Party wa Oosawagi! no Maki
English title: Pokémon: Pichu Bros. in Party Panic
Japanese title: ぼくたちピチューブラザーズ　～パーティはおおさわぎ！のまき～
Type: Special
Episodes: 1
Source: Game
Genres: Adventure, Comedy, Fantasy
Studios: OLM
Producers: Nintendo
Duration: 20 min
Rating: PG - Children

This is an animated cartoon that was released inside the game Pokémon Channel.

A half-hour long anime show, broken into five short segments, featuring the Pichu Brothers. Meowth throws a party that the Pichu brothers and their friends are not invited to. After a series of events, they find out they were invited, but their invitations were simply delivered late. They go to Meowth's Party and hear him sing. The series has a total of five episodes, each on its own channel.

(Source: Wikipedia)