:O_o: Is it possible to create random battles that becomes more and more difficult in a same area or map while progressing through the game without making every event (collision method)?
go to your map and then go to map properties and there should be a tool to insert monster groups where ever you want.
I know, but I want to make that while progressing in the game the enemies in the area (the EXACT same area) will become stronger or put different ones.