Would it be possible to make successful captures teach a corresponding summon skill with limited uses, then make it go away once all uses are expended?
Viewing post in Beast Capture for RPG Maker MV & MZ comments
I can add an option to make captured creatures instantly join your party, then you can combine it with my pet summon system.
Game mechanics that contain something with "limits" or "counters", however, are more difficult to implement. Not necessarily the programming part, but to bring it into a handy shape that does not overload or pollute the core plugin.