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The team definitely doesn't look bad! I'd suggest going Volt Switch over Knock Off on treads, Leftovers over Rocky Helmet, and Choice Band on Rillaboom for a stallbreaker. Otherwise, what threats have you encountered?
i did find some tera ground and dragonite as problems. Also clodsire kinda walls like everything and can wear the whole team down. Also heatran is hard. When it appears its needed to tera water moth and kill, if it switches out the team is cooked.