I’ve been playing through again, and want to know if there’s any way to evolve him in-game. The wiki says I can through a witchdoctor, but I have no clue where that is. Help?
Hey! I have a Delta Scyther and going to evolve her through the witch doctor. The W.D is in Helios City, accessed through the basement of the department store! Also to get the mega stone when you traded your scyther go back to route 6, until you see an old man. I think you evolve scyther by Metal coat in the older versions but now i think you have to trade her with a nevermeltice? hope this sort off helped! 
sorry if it didn’t though…!
It still evolves via Metal Coat 