If you've already scattered the Legendary Dogs, then Entei will be wandering with Raikou across Johto. Your Pokegear has a map with their heads on it - where the head's located, that's where a Dog is. You have to be on the same route with Entei, then just wander in the grass until he appears. He may move, in which case you'll have to follow them to the next route. I suggest a Pokemon with an ability that will prevent Entei from fleeing, as well as possibly a status ailment and obviously something to knock its health down with. Although if you use a move that keeps him from running, he'll use roar to get away
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No you cannot catch Entei in Pokemon Emerald.
No, you can catch Entei without catching Moltres.
yes you can get a second chance at catching Entei i did
Its easy, all you need to do is catch Lugia and the 3 like entei then take them to the dragons den, surf, then catch a dratini.
you find it in the wild in johto region