Hexadecimal code doesn't match with Invoke Battle?

Even though the event commands list doesn't mention anything special for that commamd other than removing swoosh and transition, then a flag for battle background.

It almost sounds like its either calculating the value based off something, or its using that value to choose one of the local formations (that really doesn't sound right but).

I would try a few consecutive values, starting with the vanilla formation, write them all down and look for some sort of pattern. Then go from there.

Without a better answer, go with the most simple basic test first.