You use PIDRNG to see which frame has a PID you want, and advance to that frame. Make sure your C-Gear is off because the C-Gear advances the frame.
To advance the frame, you can take one step or turn in grass/a cave to advance the frame by 2 or 4 (you have to check using the PID RNG seed check code, just compare the seed you get to the seeds of the other frames) or by saving your game to advance it by 1. NPCs also advance the frame, but they're not controllable.
If you're using Sweet Scent, you usually want to advance to 3 frames before your target frame. At least that's what I've been doing. Oh, and make sure you have a repel on when you're doing steps/turns.