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Pikachus from Pokemon Yellow will have an unique ability once transferred to Sun and Moon. The ability is named Hyper Charge and it doubles both the SP.Attack and Attack of Pikachu.
Blastoise, Venusaur, and Charizard will be holding special Z-Crystals when transferred from any of the VC games. Charizard's special Z-Move is a powered up Seismic Toss that deals fire and fighting type damage.