After you find entei in the burned tower for the first time, entei will then flee to any route in Johto. Each time you change route, entei will, therefore there is no point flying to where he is. So just walk around changing routes as you do. You should eventually find him.
Hope I helped!
you get it at the battle park for 32 b.p its easy to catch enti, rioku, and latios with it
Latios(Latias in Heartgold), Suicine, Riakou, Enti, Ho-oh, Lugia, Moltres, Articuno, Zapados There is probably more but I haven't discovered them yet! ;)
you go to route 9 and in the grass This is in soul silver only Heart gold players
Most you will have to find and some like enti, raicu, and latias. I do know where articuno is. Located in an ice cave at the cinnabar island gym. When you get to the steps go down the ice path and go through the ice cave, it gets a little crazy but then you'll go up and down ladders and go into water and finally reach articuno. Moltres the fire legendary bird is located in mt. silver
you first beat the game then you go to fiery field and finish the maze and enti will be there
go to denver
you can go to the mt silver
You go outside :)
go to icefall cave
South.
bummbummbumm
PC box