Yeah, I have a SBS battlescript already. But I don't know how I can create enemies, which use the script too...
like here the scorpion:
Is that option available in your battlescript?
For example, with symphonia you need an addon-script to change the enemy battlers into sprites. That is because not all people want to use sprites and they don't need their script editor cluttered with functions they don't want - Symphonia also has instructions how to install that addon and how to configure it.
It might have helped if you told and linked us which battlescript you're using, then we could help you better...
EDIT:
When I wrote the original answers, I hadn't seen that you were using VX, not Ace.
So my suggestion of Symphony as an example was wrong, because that is an Ace Battlescript.
But other than that my basic answers would be the same - your battle script needs to support that, and you have to follow the script's description on how to set that up. I just can't make suggestions because I don't know which VX CBS does support this...