I think they nerfed just how many starters there were in the wild. At least thats what I get the feel of from the first few days of the event and now. Pokeballs seem to be the trouble for me now, but I'm almost done. Went from having 0 charmander, 3 bulbasaur, 7 squirtle candy pre-event to 94 charmander, 98 bulbasaur, 94 charmander. I already had a wartortle and an ivysaur, but I managed to catch a charmeleon and another ivysaur in the wild. Even ran into a charizard yesterday but after 5 balls my game crashed.