Actually, you can't. You can trade him from Pokemon Heartgold or Soulsilver, but you can't catch him. There was a Special Distribution event a little while ago for Entei Suicune and Raikou! I chose Raikou.
Throw a pokeball at it
(Ignoring that since that is an obvious answer)
Awake Raikou in the burnt tower (In the town where you fight Morty). Raikou will then run away. Then, he will be at any area in the Johto region. Once you see it, he will appear in your pokedex so that you can track it down.
Then, as what the guy said, throw a pokeball and catch it after you had lowered its health or/and used moves that restrict it from running away.
Visit the burnt tower in Ecruteak city and go to the basement. The legendary trio will scatter. Now you must get a Pokemon (or many Pokemon) which know these moves:
Mean Look
False Swipe
(Any medium power move)
(Any move which puts the foe to sleep)
You have to have the Pokemon who knows Mean Look first in your party. Go to route 37. Raikou will most likely not be there already but each time you go under the arch to Ecruteak and back to 37 he moves. Keep on going back and forth till he is aligned with you on Route 37. Then go in the grass and start running. He should appear if you followed my other solutions. When he appears use Mean Look. He cant escape. Use a medium power move so his health is in far yellow or red. Then continue using false swipe. The good thing about false swipe is you cant kill them, it will always leave them with at least 1 hp! When Raikou has 1 hp use a move which will put him to sleep. Now use your best ball. Keep on using your best balls till you catch him. This strategy will work on Entei
the easiest way is to use mean look and start attacking it (But make sure the Pokemon isn't too strong)than keep on trying to get it by throwing ANY kind of Poke ball (tip:If you paralyze it, it will run slower because it can still get away after mean look.)
You must have both HG and SS and captured Groudon (using the Red Orb) from Soulsilver and Kyogre (using the Blue Orb) from Heartgold. Once you show both to Prof. Oak at his lab in Kanto, he will give you the Green Orb to use at the Embedded Tower to capture Rayqaza.
If you chose squirtle at the start your in good shape, all you need to do is get the national pokedex, deliver the ruby and sapphire to celio and now anywhere on the routes of Kanto (not the islands) you can find Raikou.
you need to pick squirtle as your starter Pokemon then beat the elite 4 and will be running around in the wild.
bulbasaur=entei
squirtle=raikou
charmander=suicune
You can't. You have to bring it in from another game.
in wild of johto
You can't catch Raiku if you picked Bulbasaur. Entei will be found at random
If by that you mean Legendary Pokemon then the pokedex will let you have; Articuno Zapdos Moltres Mew Mewtwo Raiku Enti Suicoon Lugia Ho-Oh Celebi Regirock Regice Registeel Grudon Kyroge Raquiza But the only ones you can catch (that I'm aware of) are the 4 you can catch in Red/Blue/Green and Yellow; Articuno Zapdos Moltres and Mewtwo
for zoroark? i dont think yu can get it in white. i think you have to transfer a shiny one from diamond, perl, heartgold, solsilver
You can only catch Vulpix in SoulSilver, not in HeartGold. You can catch it on route 36 and route 37.
Raiku Kemppi's birth name is Raiku Jaanukka Pennanen.
I haven't caught raiku but i know how and also i caught enti. you either use a master ball or if you used that just use a decent move and catch it. i have heard the best place to catch it is just south of ecruteak but i forgot if i ever seen it there, i haven't seen raiku for a few weeks. i seen enti somewhere in route 43 and then i chucked a master ball at it. raiku and enti are all over the place in johto and one other one i don't know about in kanto.
1st of all it is Raikou and by roaming Johto
you have to use faulse swipe and when you see it again use an ultra ball
If by enti you mean Entei the legendary dog then yes, all three dogs are there.
you have to fight your way to the bottom of the tower. there, you will find suicune, raiku, and entei. then, when they see you, they will run away and you have to catch them(either catch or defeat, really).
You can't catch Raiku if you picked Bulbasaur. Entei will be found at random
Theres raiku,enti,suicune,articuno,zapdose,moletres,mewtwo,jiratchi,deyoxes, rayquaza.
you dont
catch it in the wild
It's not A Raikou, its Raikou, as you only get one/two chances of battling him/her and it's legendary I would recomend getting it down to barley any life left and asleep. Catch with a fast ball
any
It's your opinion, but in HeartGold you can catch Ho-oh, Suicune, Raiku, and Entei, and in SoulSilver you can catch Lugia, Zapdos, Moltres, and Articuno. There are also more Pokemon available in HeartGold than SoulSilver. Edit: The person who last answered this question is wrong, you can catch all of the above Pokemon in both games, not in either or. I know this because I have soul silver and I have suicune, raiku, Entei, Ho-oh, Lugia, Zapdos, Moltres, and Articuno; so obviously you must be able to catch them in both.