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https://pokemonblog.com/2021/02/22/cp-limit-for-the-kanto-cup-in-pokemon-go-is-1500-only-pokemon-with-a-pokedex-number-from-001-to-151-are-allowed-and-your-rating-will-be-unaffected/
CP limit for the Kanto Cup in Pokémon GO is 1500, only Pokémon with a Pokédex number from 001 to 151 are allowed and your rating will be unaffected