Vermillion was actually pretty easy for me. I kind of fucked up the initial bits and lost most of my candies with like 4-5 waves, trying to micro everything all at once; eventually I figured out a formation that took care of most things without requiring too much micro. I ended up doing the next ~35ish waves with only 1 candy left and surviving through all of it, lol. In a way it got easier once I knew all mobs would converge towards one spot, regardless of where they came from.
For Mt.Moon 2 I did Magnemite/Pidgeotto in the top two spots with Super Effective strategy set, to quickly kill Bug/Flying types and injure the Golbats, then Mankey/Bulbasaur/Graveler in the next 4 spots set to Lowest Health to take care of the half dead stragglers that got through and any Rock types that didn't take any damage. Last spot was a Beedrill spamming the fuck out of string shot so I had time to kill some of the faster mobs. Teach your Magnemite Rain Dance+Thunder and your Bulbasaur Solarbeam if you haven't yet, that shit's amazing.
XI Wiki



