you ensure that you catch the entei, but it will be harder to catch the ho-oh using ultra or other balls
You should use a master ball.
Well,I wasted my Master Ball on Entei in Heartgold,and I wish I hadn't. But I heard you can get a Master Ball for first prize at the Lottery Corner at the Radio Station in Goldenrod city. But just because we dont have any more Master Balls does not mean it game over.
to catch suicune,mewtwo,raikou and entei
probably on mewtwo, suicune, raikou, or entei
Using a master ball
Entei can be captured without the Master Ball however it's much more difficult. Once you find Entei attack it and it should run away. Now you must find it again when it appears its HP should still be lowered so now is your chance to capture it with any other ball you have.
by defeating Giovanni, the rocket leader, in the Silph Co. building. After ask the president and he will give you a master ball(you should save it for Rikou, Entei, Suicune, or Mewtwo)
master ball. but save it if you want it to use it on entei or raioku which run in the wild
You can only run into Entei if you starter was a Bulbasaur and you beat the elite four. There is no specific spot where you can find him at but once you run into him use your master ball and catch him.
One of the roaming Pokemon ex. Raikou, Entei, Latios, Latias
you use mean look then through master balls use them or use a utra ball.
save your master ball or get a tag from wabafet and give it to a Pokemon with strong light and has a par move or sleep move and get get him to red life and get lots of ultra balls ^u can try that but what i did was i would do is on fire red get a master ball from saffron city at the big building then make a Pokemon hold the master ball then trade the Pokemon into leagreen then when ever entei comes CATCH HIM WITH A MASTAAAAHH BAAAALLL!!!!