This is the best I could do with the summoning. Its pseudo-script so it contains some events and its really a bother because you have to paste the events over and over for each monster you create. If it was me I wouldn't use it, but if you really need it by all means go. Otherwise it should be fine, its probably got a lot of errors since I haven't tested it much. All monsters have been edited to work with the system. Edit it as much as you like.
Instructions: There's a script in the database called Scene_Battle(edited). You'll need that in order for it to work. For each map you plan to have encounters, paste the event at the top that changes your party. Each of the monsters needs to have the two pages of events, you need an actor who you want to summon (in this case moogle). You also need the skill called Summon me!, variables one and two free (you can change those), and the common event 001. Please note that only Ralph can summon moogle since I couldn't be bothered to give it to all the default people, and I hope this helps. If there's any problems I hope I can fix them.
System: Attached