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http://pokemontrainertips.com/is-there-a-case-in-pokemon-go-where-the-attacker-and-defender-has-a-1-56x-effectiveness-vs-a-0-64x-effectiveness-the-other-way/
Is there a case in Pokemon Go where the attacker and defender has a 1.56x effectiveness vs a 0.64x effectiveness the other way?