Can Banette and Blissey be fused? If yes, is anybody gonna do it?
I am a bit confused now, does it mean that if I want more attack in Power Forme I have to put the extra points in defense?Nearly, but for its stats, you don't do the averages for Golurk and Shield and Golurk and Blade with the +40, all you have to do is do the averages/+40 with Golurk and Aegislash-Shield (let's say 74/87(+20)/115(+10)/52/115(+10)/52, which is what you have), and then for Power form you just swap the Offences and Defences, same as for Aegislash's transformation, so Power Forme would be 74/115/87/52/115/52 (don't worry about it, many other users make this mistake :]). Also, the ability is a tad confusing, but does it basically just mean that it works the same as Stance Change (shift to Power on attacking moves, to Defence on King's Shield), but on the turn it transforms into Power Forme, it gets a boost to Punch and/or Slash moves?
Like Stitch98 already said, it's before adding the additional points to the stats. I wanted to make it clearer how I distributed them in case I mess up calculating the average, which was evidently pretty smart of me.