This app was mentioned in 6 comments, with an average of 1.67 upvotes
If you mean Free DS, then you should do some research.
Free DS is a hacked ripoff of an older DraStic apk, in which they changed the UI a bit and added ads.
(there is no FreeNDS)
This one works pretty well for DS games. I'm playing BW2 occasionally on my phone, no issues at all. The ads are a little annoying, but once you start the game it's not too intrusive.
HG/SS really is great. I don't understand why they didn't keep the feature of allowing your pokemon to walk with you in the other ones, it adds such a fun little dynamic to the game..
I played a fuck ton of Mystery Dungeon on this thing, works very well. The only emulator you're going to need to pay for is the GBC/GB because they don't let you use save states on any of those unless you pay it seems like from my testing. Mupen64PIus FZ is a great N64 emulator for Android. PSP+ is amazing. John's GBA lite is the best gameboy advanced emulator on the market I used it to play like 30 hours of Final Fantasy VI. John's SNES and NES emulators are just as perfect. Awe PSX is surprisingly good at emulating PS1 games. Reicast for Dreamcast and of course GENPLUSDroid for every other Sega console.
What android version are you using? There is an usable cracked version with working settings but it only works in android less than 5, also there is the one cracked by mudlord but it is a really old version. Pm me if you want. Also there is this free ds emulator that runs decently: https://play.google.com/store/apps/details?id=com.cpu.free.dsemulator
But really I recommend you to buy it, it is the best android ds emulator you could buy it using googleplay gift cards.
This one is apparently the only free ds emulator that works full speed: https://play.google.com/store/apps/details?id=com.cpu.free.dsemulator
I really recommend this emulator: https://play.google.com/store/apps/details?id=com.cpu.free.dsemulator I played every game from AA1 to AAI and it worked perfectly. I don't think the device really matters, since a lot of people I know use the same emulator and it works without any problems. Hope it's helpful!