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Personally I think Suction Cups is the more reliable option. Smeargle doesn't have the best defenses and if it can't use spore before the opponent or isn't protected by a substitute it is likely to be KOed. Like darknessmalice said, Lucario and Siczor both have priority moves that can destroy...
You could try using Octillery as a receiver because it's ability prevents it from being forced to switch out. It may have awful speed, but Ninjask's speed boosts will cover that and it has many special attacking options.