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I used a couple of quick balls when I encountered it, after that I used Thunder Wave on it and weakened it until it was on red health/orange health.
I continuously throw ultra balls at it until I caught it.
On Platinum I tried for ages with Quick Balls, Great Balls, Ultra Balls, and Poke Balls. Eventually got tired and used a Master ball. I've got plenty more coming from my Emerald version xD