Master Foo and Master Shao
Master Foo is the grandson of Master Shao. Foo trained under his grandfather for a long time. Evolution really interests Foo, but he will never be ready to evolve until his grandfather passes. He's long since met the requirements, but has been holding back all this time (it's rumored to be out of a strange respect for Shao, but Foo refuses to talk about it).
Master Shao has traveled the world and learned techniques that most Pokemon forget exist, still. He's a tutor for all sorts of moves a Pokemon might not normally be privy to. He has a hut out near Snowy Village and has been a hermit for a while. He's known Zhu for a long time and finds delight in the fireworks shows his friend puts on display.