In HG/SS, Misty is forever looking for a good date, and sometimes takes off from the gym in hopes of actually finishing one. If I remember correctly, they are always being interrupted or scared off which frustrates her.

Maybe she could try to share tips on popular dating spots/get or give other random dating advice?

She's also always looking to be stronger, and obviously she loves swimming/water/DON'T POLLUTE MY LAKES GUYS. From looking at the wiki page, it also says she wants to travel to meet strong trainers one day and worships Lorelei of the Elite Four, so poking around those topics would be good, too?

Also, especially around this time of year, you could have Falkner focus on his dad/fathers, too?

If I'm remembering right, Blaine has a penchant for disguising himself, but I don't know if that's helpful for this type of thing.