How to get the Pokémon Mewmew?
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Detective Emma's quest. Go to New Alexandria when you're decently close with finishing the game, around like after the 7th or 6th gym badge cause you need to be around level 60 or 70 for this. go to the ruined house with a sign on it nearby the house that holds the entrance to the Blue Oak. and you should be able to start her quest line. and after you finish it talk to Evan and he'll give it to ya