By the way the game doesn't advance at exactly 60 frames/sec so when you get really high up in the frames you'll be off (this happens on a retail cart too). My Careful spread was at something like 144,187.xxx frames so I made a save state at frame 144,180,000 and backed it up. I was off by about 11000 frames at that point. That save state let me get all 6 pokemon that I just got.
Do it right before you check it the last time before it shatters. It goes to near the top-middle of the area and glows bright red. Do note that if you take more than the minimum amount of steps to reach the triangle it will reset the triangle so once you're in position don't move at all.