Can you only run a multibattle a certain amount of times a day? It won't let me run Leviathan anymore, and every time an error message comes up that says something about 5 AM? I assume it means that I can't run it until tomorrow.
Yes, you can only start each multi-battle 3 times a day, with the exception of event bosses of course. You can still join into other players battles though.
Not sure if any of the mods still support this community, but they should be aware that the forums are infested with bots and that their forum needs to be upgraded.