Go to codejunkies.com for action replay codes, as it is the official AR website. These codes are the only ones which are guaranteed not to mess up your save file.
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you can find an action replay code at code junkies or :type "action replay codes for harvest moon ds cute
23333harvestcow9
Go to FOGU.COM
you have to have an action replay and then you get 96 of them
if you have an action replay there are cheat codes for it