U use rainbow wing to catch Ho-Oh in Tin Tower > Ecruteak City. I suggest you get him down to red health, paralyse or put him to sleep then use an ultra or great ball. Do not use your master ball on Ho-Oh..
Raikou and Entei are found in random place and I previously found it in goldenrod and others but there's no specific place.
A2:
I am pretty sure that they only appear at random but I found both within a half hour below blackthorn. I bought a max repel, went south, hopped the fence on the right side, and walked right to left for about 60 secs and I found entei. I walked around for a awhile after that and couldn't find raiku so I flew to goldenrod and flew back to vlackthor and found him there. I worked for me but I don't know if its accurate. hope I helped.
You cannot get it unless you do a certain glitch.There are 4 different forms of missingno.To do the glitch you should type "how do I find missingno in pokemon crystal" in any of the search sites like google.com -Answer by:pokemon27
Q:I can't get Enti or raiku I tryd forver but cant find them
P.S. I have woken them up and caut suicune
P.S.S. I beat Elite four?
A1:
Buy 5 or more max repels,go to a route with grass.usea max repel,then walk in the grass for 20 seconds.if it doesn`t appear,go to a different route,a town,a cave,or building.reapeat until it appears. p.s. if repels effect wears off use another immedietlyy. p.p.s. repel attracts them so use your money on repels,super repels,and maxrepels
A2:
Go to the city near physic gym and steel use a bug and a normal pokemon that will attract raikou stay there 5-15 min I did it 6 times it worked and also catch entei at kanto near celadon grass area use poison and water type there that will attract it also dont forgot use weak pokemon that will attract it better
A3:
The others are correct, but if you have already seen these pokemon in the wild but they got away, you can track them by going to their pokedex entry and clicking the option 'area.' It will say Raikou/Entei's Nest at the top and there location will be shown as a blinking black icon. Don't fly to the closest town because they will move, and riding your bike increases the chance that they will move to another area (walking's best). Good luck! (:
A4:
The others are right, but also make sure to have a pokemon that knows the move mean look because the legendary dogs will run away and you'll have to find them all over again. ):
In the wild after you kill/capture suicune use your pokedex to find him get a few repels or better repels then go to grassy areas now use pokedex to find entai now go in the grass when thats where entai is now use some repels and look for entai. -Answer by:pokemon27
Lords of Legend RPG 
What is the Rainbow Wing for?
Bogus
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