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Every Gym leader and Elite 4 member will get their own mega.
Roxanne - Probopass
Brawly - Hariyama
Wattson - Manectric
Flannery - Toarcoal
Norman - Slaking
Winona - Altaria
Liza and Tate - Solrock and Lunatone
Wallace - Milotic
Sidney - Absol
Pheobe - Banette
Glacia - Walrein
Drake - Salamence
Steven - Metagross
Maxie and Archer will have Camerupt and Sharpedo while all the admins with have Mightyena as megas.