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Heracross is a bug/fighting-type Pokémon owned by Alva debuting in Volcanion and the Mechanical Marvel. It was temporarily used by Jessie and is able to Mega Evolve.
Heracross was loaned by Alva to Jessie for capturing Magearna. Jessie had Heracross evolve into its Mega-evolved state and attack Ash and others to capture Magearna, however, it was quickly defeated by Volcanion.