Ok, I've read a question asked about legendaries, and many of them appear if you defeat the champion again. How about the legendary bird trio in RED version?
The "Reappear if you defeated them after beating E4" was only implemented in versions: Pt, HG/SS and B/W.
So, Zapdos, Articuno and Moltres would reappear in HG/SS, but not in red.
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