When Maya suggested finding the fossil hunters, Khelfin frowned. 

"I bet every single one of them went undercover when Miss Amy got murdered. They are no fools, their first priority is vanishing from the radar." 

Next up, Aro suggested that he and Maya would investigate at the old Genesect HQ. 

"Actually, that's not a bad idea. A dangerous one but it could actually work." 

Khelfin looked over to Sabrina, seemed to hesitate for a split second but then nodded as he made up his mind.

"Creepy Sabriny and myself will go to Goldenrod city. If we can get the media on our side, we can find us some allies. When both of our missions are done, we should meet up at the old dojo of Saffron City in Kanto. It's the easiest to reach from both our locations and has a high chance of being a Cooper-free area. The train will probably not be functional, but we'll walk." 

Before they all started their quests, Khelfin adressed Aro and Maya once more.

"Oh and mates. Plant a bomb at those HQ while you are there anyway."

His laugh could mean that he was joking but he might just as well be serious about it, given the circumstances.