>>39881410Instead of being an average uber it would be an absurdly broken one. Being able to choose your ideal stats each turn is huge, especially with Attack, Defense, and Speed being so different. Being able to rock defense to eat a priority move and hit pack, just switching to attack to nuke anything slower, or going to speed to beat out choice scarfers.
Aegislash shows that "technically 720 BST" from form changes is nearly as good as actually having 720 BST, so I'd figure that a free-transforming Deoxys would be nearly as good as actually having 910 BST.