Flipping to or from a page without any caught/defeated info doesn't advance the frame by one. It doesn't do anything. If you do like you listed, you'll end up on frame 881. Trust me, I just did Heatran. My target frame was 7122, his monster frame was 1, and I had no roamers. 7122-1-5*=3558 Journal Flips. *=because I took 128 steps w/5 pokes in my party in order to get my even frame with an odd monster number and no roamers.
Oh, yeah, What I meant is that if your "target frame" is 402, but Dialga's monster frame is 1, and you have no roamers out, you'd have to have an odd number of pokes in your party and take 128 steps to advance your frame by an odd number (1,3, or 5) in order to get that even target frame of 402. Make sense?