Help with Creature Events

[Sir Bananas]

I don't know if this is possible, but is there any way to put a OnUse script on a monster?
Im trying to make a script where you use an item an a monster is summoned to you, and when you use it something happens.

 

[Cykotitan]

monsters can't be used, only objects and ground tiles

 

[Sir Bananas]

But i've seen mount scripts where u use your summon you mount