well to get the blue feather one girl of your choice has to like you at the MAXIMUM level then you can buy the blue feather from the supermarket (for harvest moon ds)
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The Blue Feather costs 1,000G.
The Blue Feather will become available for purchase at Karen's store once you have a woman/man up to an Orange (50,000 LP) heart level.
you have to get your persons heart up to it least orange then you can buy the blue feather at the supermarket once the person's affection is at least 50,000, the blue feather will become available at the supermarket(you can find out the affection the person has toward you by getting the love ring at the sprite casino.) the affection needs to be 60,000 so you can propose
If you save the Valley and make it to year three Chester will come by your house and tell you how to get married. After that the Blue Feather will become available in Louis's item shop.
Summon Lugia with it at @ Whirl Islands Ancient Chamber