[Script] Setting up HM overworld effects without teaching it to a Pokemon in pokeemerald

[aicaimze]

could somebody help me with this? it's pretty much the one feature i want to put into emerald.

ideally it would be like:
check for badges, if you have the badges needed you can use those hms so long as you have it in your bag

 

[Sapphire Jester]

This thread explains how to implement HM field world effects to require having an item rather than a Pokemon knowing the HM move. That will let you use the field effect by interacting with the related object on the field. The only issue I could see is if you want to also allow using the item from the menu to activate the field effect, as presumably you'd still want the HMs to teach moves.