If you've already visited the burned out tower and the Pokemon run away, use your poke-map to find out where Entei is at. ( Warning: Just like with Pokemon Diamond, Pearl, Platinum, and Heartgold if you follow too quickly the Pokemon will run off to someplace different.
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you find it in the wild in johto region
you can't breed legandarys
Its too late.
Entei is roaming Johto after you encounter it at Burned Tower.
you can but,either you need an AR or just have some luck.