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Not much is known of this short at all. It is being shown on the ANA flights on the Pokémon Jumbo Jet between the 1st and the 31st of August in 2005. Here is the info we know

While having a picnic, Pikachu & Co. find out about a nearby Ghost Festival. They go and investigate and find the festival full of Ghost Pokémon from Gastle to Gengar to Banette.

To Be Announced

Pikachu's Ghost Festival