If a Pokémon can use a TM such as Rain Dance to enforce rain (not necessarily having it, but the ability to use it; I'm looking at an Egg Move Sneasel project I did a few days ago and can breed one more), will that meet the challenge?
Can we train them however we want, such as in a Friend Safari full of Audino and Chansey?
Do we have to have only the challenge Pokémon active at all times during the challenge, once we have all six? Or can I use something I already have to fight and help them gain experience via the Exp Share? (I'm doing the breeding challenge too.)
I could probably do this in two days (but likely won't LOL) depending on those last two answers. I'm hoping Sneasel would fit into the weather slot with the TM; if so, I'm in. I just have to avoid a Dark/Ice favourite, and figure out a "favourite" to challenge the next person.