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I need you to clone 3 arons, you keep the origanl.And level up the higer aron untill it evoles into arrgon. I need 3 of those. You keep the forth. and keep all the moves it has.
You could do the massage girl in Veilstone and the Ribbon Syndacite in the Resort Area to raise happiness. Also you could give it a soothe bell. I think using Rare Candies increases happiness too.