Sorry for the lack of details.
Majestic Force doesn't deal any damages, it just boost Sp. Attack. But, if you have a code for damaging move that changes the mon's form, I'm interested.
Forturein has two forms, the Normal Forturein and Fortune Forme. Upon using the move, it's either Forturein transforms or not. Creating a new slot for Fortune Forme is the most practical way so changing stats is by changing Normal Forturein to Fortune Forme. Again, IF you know a code for "the user changes its form upon using the move" and/or "the user changes into one of its form by using specific move", I'm interested. But not really necessary.
And sorry for many questions, and you're one of those people who know much about battle scripting and stuffs.