seriously, parases are the way to go. I offered a newborn on the GTS for a kabutops as a joke a few weeks ago and 30 seconds later, someone sent me one. I tested it again by requesting a salamence and somebody sent me a level one-hundred one. so I just decided to start from bulbasaur and see if I could make it. I name them all Keenan, if you ever want to help me out.
those events. it sucks that the only way you can fill it is by luck. I'd rather a really hard dungeon/mountain challenge that you had to get through then having the game at the right time.