Scrooge is busy spending his time training, and will notice the Snorunt everywhere. He's not going to make a special effort to catch one, since he tends to save his Pokeballs (go figure), but if any get particularly clingy he'll go ahead and add it to his roster. There'll be some battling here and there, the aforementioned training, but for the most part Scrooge will be more concentrated on his existing Pokemon than the Snorunt everywhere.