The only way to obtain them is by trading from Pokemon fire red/leaf green being as you can't trade between 1st/2nd to 3rd generation.
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Entei, Suicune, and Raikou are not available in Pokemon Emerald, Ruby or Sapphire. They can be brought into the game by trading.
Raikou is best because entei and suicune are fegget Raikou all the way 2 reasons He is way cooler then Entei and Suicune. Number 2 he could whoop Suicune and Entei in a battle So suicune and entei are good but overall raikou is better
You can get lugia, ho oh, entei, suicune and raikou
Suicune is wandering around Johto after they (Entei, Raikou, and Suicune) runaway from the tower.
Starter:Charmander-Suicune Squirtle-Raikou Bulbasaur-Entei