Not completely true; I'm working on a hack and I've been documenting all the changes and discoveries I'm making. What you described only happens when a trainer class is not compatable with a battle type, e.g. Lass with Double Battle. Some trainers work completely fine with Double Battles. The 1st gym leader (trio), for instance, can work properly with Double Battles.
The reason it works is because it specifically requires you to talk to the gym leader, whilst the regular trainers force you into one when passing by. When you talk to a regular trainer, it ignores dialogue but the battle happens, so I'm unsure about that. One thing I do realize though is that the AI is a bit weird, since in double battles, the enemies will occassionally attack each other. Why? I'm trying to look for an answer as to why but if any of you find out why then please tell.
B/W Trainer Editor
in ROM - NDS Research and Development
Posted · Edited by Fricka
The reason it works is because it specifically requires you to talk to the gym leader, whilst the regular trainers force you into one when passing by. When you talk to a regular trainer, it ignores dialogue but the battle happens, so I'm unsure about that. One thing I do realize though is that the AI is a bit weird, since in double battles, the enemies will occassionally attack each other. Why? I'm trying to look for an answer as to why but if any of you find out why then please tell.