So Sion opted not to join the guardian corps way back in the day for his own reasons, but he has always been opposed to team rocket and been keeping an eye out for opportunities to do something about them! So if Riku wants to discuss shenanigans for him that's always an option.

That or, y'know, talk about oldtimer league champion/running a gym stuff.

Alternatively Geddoe is an old man and a mercenary so if Riku needs some muscle (or brains--despite appearances Geddoe is both observant and clever) for an anti-rocket heist that's an option!