There’s this theory going around that the Poke Pelago guy is Lusamines husband and I think its really interesting so I wanted to make a post about it.
When you talk to Gladion after the main story he tells you his Dad disappeared during an experiment (presumably because of an accident with an Ultra Wormhole) and his Dad was the first one to confirm the existence of the Ultra Beast and Ultra Wormholes.
And if you go talk to a certain person in the research lab he says:
So if Gladions father really was the first person to discover the Ultra Beast then he must be this Mohn guy which means that this dude
Could be the father of Lillie and Gladion. His hair does somewhat resemble Gladions.