I'm not sure if others are experiencing the same of what I've noticed so far as trying to RNG for any of the roamer before or after facing Red. It seems that before facing Red that my frames are consistent when I get to the last elm call before entering the elite 4, but after facing Red, there seems to be an inconsistency that makes it frustrating to get the correct frame. When I try my usual target elm letter, I end up with an actual frame 6 ahead. When I adjust back 6 elm letters, I am over by one, and then when I adjust by yet one more, I am actually under the last elm letter by 4, so I don't understand what is going on. Good thing I have a save of my game before facing Red and have re-tested that instance and it works.
So I'm wondering if after facing Red changes the way RNG calls are made when doing the elite 4.