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Steal and hide regional pokemon to replace them with pokemon from Kanto.
Force local gym leaders to use the same pokemon types used by their Kanto equivalents.
Infiltrate gym personal and block the entrance of challenging trainers unless they bring a pokemon with type advantage behind the leaders' back.
Make pro-Kanto propaganda so people idealize Kanto and start to think it's a better place than their regions.
My final plan would be to catch a super-powered pokemon to nuke every region but Kanto and delegate part of my team to act as rescue personnel to help people flee into Kanto; only to trap them inside of Kanto so only Kanto can exist.