“ why do you want to know so much about cha— rose…? “
He doesn't come across as a talkative sort, but it's when Leon asks him this question that he unflinchingly begins on his tirade:
"He and I met twenty years ago in Sinnoh, both as businessmen, while I was in the process of my ultimate goal to reset the universe. At the time I considered him unremarkable, which still holds some weight considering his complacency in the sorry state of things, but he allowed me to speak with him at length despite my disparaging remarks. This on its own was noteworthy and would make him stand out in my mind. For the short time we remained in contact, we partook in each others company enough for an odd relationship to form wherein we were engaging in borderline romantic behaviours.
All that being said, my plans for resetting the universe came to a halt when a shadowy Pokémon rend the fabric between this world and a pocket dimension where all non-existence lie, and imprisoned me in said pocket dimension. I was kept there for nearly twenty years, as I've learned since returning to this world, and while my disdain for this world and its inhabitants is not entirely removed from me I acknowledge that the ideal for my perfect world may be met through other means. Because I am bored of existing, I eventually decided I wouldn't condemn myself to a depressive slump but to attempt living as I am "supposed" to, and in this new era of my life I traveled to Galar.
In Galar I met Rose again, I suppose you know him, and he was excited to see me again. Him being one of the few connections I had left in the world where I did not feel strangled by expectation, I spent more and more time in his presence and we rekindled our relationship. He however hadn't learned anything from what I told him all the way back when we first met, because his life was as vapid and shallow as it had been back then, only now he had more influence and wealth. Essentially, he'd been conditioned to believe that staying his course was how he would become successful, which may be true, but isn't conducive to my interests.
Because of this, and my realising that I'd let myself become... attached... to someone who was irritating, I decided my first course of action was to fix it by force. If he wouldn't listen to the truth through my words alone then I would confront him with the truth through any means necessary. If he doesn't change, then at least I will be able to hurt him in the process for the idiocy he's displayed and my time being wasted."
"Now, unless you have anything that will help me towards this goal, I don't have time for you."