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Fuck yall, here's how to get the postgame Mist Stone: Do the Team Rocket event at Silph Co., Rematch Youngster Joey and maybe fight Yotsuba, talk to the boy in the mall at Goldenrod about "his dad works for Silph Co.", go back to Saffron City via train, go inside Silph Co., lastly FINALLY attempt to take the train back to Goldenrod.