Because like every other legendary you only get 1 chance to get it so even if you run away you just gave up that chance to get it so that's why you must always save before trying to get a legendary pokemon.
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No, Butterfree cannot learn Fly.
articuno,moltres and zapdos are roaming around like mespirit.dont fly to where they are or they will go away.they sometimes go away anyway so simply fly to where they are until they are close.good luck!
You can find Zapdos in Power Plant only once so if you let Zapdos fly away or if you defeat it you can never find it again in LeafGreen.
simply fly off or use the ferry.
After you get the National Pokedex, Zapdos, Moltress, and Articuno will all be wandering around Sinnoh. Locate them on the Marking Map and go to where they are, but don't Fly there or they'll move.