@The Bunny Gamer Yeah, it's a great idea but I was thinking about a "minor event" inside the mob where player must fight with the monster from inside to make it way out!
This is why I wanted to teleport the player, the only way i found to do this is using a global switch (when the mob dies is start a event to the "last hit" player that instantly respawns the monster and teleport the player to inside his belly), when the player break the monster heart a new global switch is activated so the monster don't respawn anymore and the player is send to outside the mob, after some seconds an auto-run event turns off every switch for the next fight!
Hope everyone can understand my bad english and thanks for the help...!! ><
So I just noticed I don't need to change the numbers, I can change the equation too lol
I was going to delete this topic but I will leave this information here just in case someone need this!
Kagamine's post in Enemy teleporting player was marked as the answer