Mike choose to simply relax and let them seek him out, he did open one eye though when he felt a Riolu coming out it's pokeball and payed attention when he sensed Mail seeking out his Lycanroc who was watching Maul from the distance. In fact, Mike's entire team had been watching the group since they first came to Aloha and when Jen joined them.
Mike had come to Aloha for another reason though, his friends in the Aether Foundation had told him of curious things they had heard and seen in the Aether Foundation.