Boss that transforms.

Hey everyone I have a straight forward request that I believe would be here for script. I've wanted to do a boss that can transform into a random form of itself every 5 turns with out the chance of it staying in the same form. I've attempted myself but I get stuck with it just changing to the same forms at the same turn and I'd rather this boss keep you more on your toes with adapting to it.

That should not need any scripts, just a troop event with a sequence of conditions and enemy transform sequences.