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you don't
You can't, trade with soulsilver
to find Blue in HeartGold or SoulSilver go to Cinabar Island next to Seafoam Island and go right next to the Pokemon center.
You can only find Skarmory in the Pokemon SoulSilver version.
You'll need to trade for it, because evolving Feebas will be impossible in Pokemon HeartGold and SoulSilver.