Oooh, sounds like a fun project. Would TMs and HMs work as usual? Since Cecil has his reusable Return and it's worked on everything except Ditto up until now, he'd definitely try it along with his reusable Earthquake and all his HMs. He miiiight also go for Toxic since he's long realized it works on many, many things.

...Congratulations, NPC, your wealth will be well-deserved.