HEY 3DS USERS!!! i did some reaserches and i think with a modded 3ds and a special relay server running online you can use wifi to simulate local multiplayer and play mc 3ds online like 2 players are in the same room! so maybe its kinda possible to make online multiplayer.
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The 2DS and 3DS have the same hardware (besides 3D).
I think each person would need 2 3ds consoles. one to act as the other player, and one for you but the issue is that the 3ds cant do both local and online play at the same time