Haha, I wouldn't say I'm a RNG master, but yeah, it is possible. It's actually very easy (imo). You can just follow the instructions in this link: http://www.smogon.com/ingame/rng/. The only difference being is that you're using a 3DS and not a DS. DS has a 1 second delay and I believe 3DS has 8 (so if your target time is 19:30:08, you enter the game at 19:30:00). Don't quote me on that, but it's either 7 or 8 seconds. Really, that link has it all (except for a few things).