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In hindsight, trying to clear both of the Mt. Battle modes back-to-back was a terrible idea. I got through about 20 trainers on the second run and then completely lost interest for a while until I finished it off today.
Doubles was a bit harder than singles, probably because the other trainers had a bit more strategy to their teams instead of just throwing together some strong-ish Pokémon, but they still weren't much of a threat until around the 90th battle. Losing one or two team members to random crit Earthquakes was about as bad as it got.