Ok, here's what you do.
1.Go to a pokemart and get around 50 ultra balls, and 40 super repels.
2.Check the pokegear often to see where the legendary is.
3.Do not use fly. Track the pokemon down on foot, that will make sure it does not change spots every minute.
4.When the legendary is at the same place as you, spread a repel and make sure a pokemon with a move that will stop the legendary from escaping is at the front of your party.
5.Make sure the head pokemon is a lower level than 40, or else this won't work.
6. Walk around in the tall grass, checking the pokegear every minute or two to make sure the legendary is still there.
7.Have patience. This may take a while.
8.Eventually, the legendary will appear.
9.Start with the move that will stop the legendary from fleeing.
10.Whittle down HP, be careful.
11.Don't use the master ball. When you have put enough damage on the legendary, start throwing ultra balls, but make sure the legendary can't flee.
12.You'll get it eventually. It will take time.
Note:this method only works with Entei or Raikou.
1.Go to a pokemart and get around 50 ultra balls, and 40 super repels.
2.Check the pokegear often to see where the legendary is.
3.Do not use fly. Track the pokemon down on foot, that will make sure it does not change spots every minute.
4.When the legendary is at the same place as you, spread a repel and make sure a pokemon with a move that will stop the legendary from escaping is at the front of your party.
5.Make sure the head pokemon is a lower level than 40, or else this won't work.
6. Walk around in the tall grass, checking the pokegear every minute or two to make sure the legendary is still there.
7.Have patience. This may take a while.
8.Eventually, the legendary will appear.
9.Start with the move that will stop the legendary from fleeing.
10.Whittle down HP, be careful.
11.Don't use the master ball. When you have put enough damage on the legendary, start throwing ultra balls, but make sure the legendary can't flee.
12.You'll get it eventually. It will take time.
Note:this method only works with Entei or Raikou.