Yes. :) Just save in front of that house, with only the event Arceus. Keep advancing frames until you reached your target frame - 6/7/8, or what your game will advance. :) And yes, if your seed is on frame 45, and your game advances 7 frames from start to end, you have to advance with calling/radio until you reach 37.
And yeah, it'll take pretty long, when you reached the point you can pick one of the three legends, Arceus moves to the center, and then there's a movie, which'll last for like 2 min >_< (Giratina and Dialga were right on the first try, Palkia took 4 tries >_<)