Looks pretty insane, it has the movepool of Gallade + Gardevoir and the stats to do whatever it wants.
It can go full physical, full special or mixed and not suffer from low stats or move BP (spirit break is better than psycho cut so yeah LMAO), it has boosting moves for both offensive spectrums and even retains Agility from Gallade's new learnset.
It even has the 2 lovebirds' Doubles moves with Imprison + the Guards + TR.
tl,dr: Iron Valiant is looking fantastic and looks great. Great mon 11/10.
I look at it from a design perspective and...
I love its appearance, I love its typing (I wanted Megallade to be Fairy/Fighting and get Moonblast
forever ago), and I love that its weapon is detachable/changeable.
My one problem, and I know you already know this, is the shiny. I love the way that it looks, but the color scheme my superhero self had as a kid was orange and blue. Default Ralts-family shiny would have been preferable.
TL;DR: perfect idea executed
almost perfectly, but it tripped at the finish line.