>>56411695Training Jigglypuff is difficult if you aren't dedicated. The ones from Kanto didn't even learn an attacking move until much later, forcing you to end PP and Struggle your way through wild bug types who can't even fight back.
That's why the idols always pick something else like Clefairy, Sylveon, Pikachu, Eevee, and other very popular cutemons. The chance to see a Jigglypuff trained by one of them is very slim.