Answer: Action Replay does work for the 3DS console, but as of right now (24 July 2013) no 3DS games are compatible with the Action Replay 3DS due to hacking problems. You can still use it on regular DS games but not on the current 3DS games. To sum up my answer the answer is yes and no.
The original action replay nor the action replay dsi work on the 3ds. There is no current action replay for the 3ds at the moment but my thoughts are that there will be one soon.
No, the action replay for the Nintendo DS will not work on the 3DS.
No. It has not been announced yet, but there will probably be an Action Replay for the 3DS.
Depends if its a 3DS Action Replay or not. If it isn't then no, If it is then yes.
No. The new software blocks Action Replay DSi and it is unknown if and when an Action Replay 3DS will be out
no
no. it will not work. im guessing that eventually action replay 3DS will come out and then you could use it on 3DS games.
No, it does not.
No, it will not work
yes
eventually the 3DS will be hacked and R4 and action replay will come out.
There are two different Action Replays, both called Action Replay DSi. One has a black label, and works on the DSi and older. The other has a blue label and is updated so it will work on a 3DS, however it does NOT work with 3DS games, it is simply a regular DS cartridge action replay that is compatible with a 3DS console.