Look, if you want a GBA Emulator for Windows 8 laptop then forget about drastic and myboy, cause both support android.
but as you asked I'll clear again, Myboy is for Android and it will only Play games like Pokemon FireRed, leafGreen, Ruby, Sapphire and emerald, also you can play nearly every Hack..
And Drastic DS is For "3DS" games like Pokemon Black&White, HeartGold, SoulSilver, X&Y, though as I said both Myboy and drastic only Runs on Android.
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Hope I Helped. :)
EDIT: I Found I really Good DS Emulator for Windows 8, on it I assume you could play Pokemon HG/SS or X/Y
Here--->
https://3dsemulatordownload.net/