You mean the default battlers? The ones that come with the game? If that's the case, you have to modify the configuration a little to tell the script which monsters are the default ones.
On Line 22, you first have to switch the "false" to "true", if you haven't already. Then, on Line 24, inside the brackets, give the ID of the monsters that are default. For example, if monsters 001, 002 and 006 were using default battlers, line 24 after the "=" would say [1, 2, 6]
Hope that helps!