Funny how Ash spent days doing charity work with the Caterpie and helped it evolve twice while he couldn't make some of his own Unova Pokemon evolve. :/
In Ash's defense tho, bug types evolve quickly compared to other kinds of Pokemon, so it didn't take much effort to help Caterpie develop. Plus Ash had a soft spot for Caterpie, so I understood why he was willing to spend so long helping it. :]