You can only catch Entei if you chose Bulbasaur as your starter pokemon. The legendary dogs are released after you beat the Elite Four in Kanto. I found Entei when I re-checked the grass areas on the path before Victory road where the guards check to see if you have all 8 badges. Good luck!
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.
No you cannot catch Entei in Pokemon Emerald.
No, you can catch Entei without catching Moltres.
anywhere as long if you have 1 of the evolvetions of bulbasaur first in your party
yes
You cannot catch Entei in Pokémon White because it is not available for capture.
You can't catch entei in Pokemon black he is on a different version
You can catch him in Soulsilver but he moves around.
yes you can get a second chance at catching Entei i did
no u cant...........
after you catch a glimpse of entei, raikou, and suicune at the burned tower in ecruteak city, you can track entei and raikou using your map.
Anything. You keep trying until you catch it.