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Switched the team around to deal with the Fire Gym. I was worried about using Marshtomp, since I couldn't use Dig because Magnitude and Water Gun would not be useful because Sunny Day, so I ended up adding Marill to the team for Bubblebeam and he pretty much soloed the whole Gym.
I am really digging all the double battles in this game. I know double battles are supposed to be harder but having two mons in the field really makes fights quicker and a lot less stressful.