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While enjoying a picnic in the harbour area of a city, the gang are curious when some of their food goes missing, but this is overshadowed when a state-of-emergency is declared. The gang learn that the city has been besieged by a large group of Gulpi... (more)n, a Pokemon known for it's large appetite. The gang agree to help get rid of the group, not realizing it's going to lead to a super-sized battle between one of the Gulpin and Ash's Treecko!