yes
yes, if you have entei raikou or suicune.
if you have firered or leafgreenyou will be able to catch entei ,raikou, suicune only if you beat the elite four then when you catch the three lengendaries then migrate then into Pokemon diamond
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.
look around for Suicune/Entei/Raiku
to catch suicune,mewtwo,raikou and entei
Its not Suicune,Entei,and Raikou its Moltres,Zapdos,and Aritcuno.
You chase Entei and Raikou across Jhoto and you catch Suicune at the top of Cerulean City.
yes ;because with squirtle you get raikou and with balbasaur you get entei
You can't. You have to migrate from LeafGreen or FireRed.
You just need one of them.
ho-oh, lugia, suicune, entei, raikou
You have to trade or migrate. You can't catch them in diamond.