The locked house in the west is not for main story but for side-quest. The book on the west can be found on a cliff with Mightyena on it, animated in 'cross' shape
I just finished the Episode. Thanks for the good work, Caz, Posty, and Ruby~ If anything, maybe Desolation can have its own Field Effect, such as field filled with Haze to prevent status enhancing moves, or Field that buffs the opponent defensively rather than offensively. Custom item is an option too.
My team is Dark Monotype and I'm expecting Rosetta and Garret to be one hell of a fight but apparently, it's not the case. A-Muk walled Rosetta while Contrary Malamar sweeps Garret. Apart from being locked from Jinx quest (so, no Mega/Z-Ring for me :'), I enjoy the story~