how do you get rainbow wing on pokemon crystal?

I KNOW
First you HAVE to catch Entei, Raikou, and Suicune(that willl be kind
of Difficult)
Then when you capture all three of them, you can go to the
Tin Tower(Where Ho-oh is) and when you enter, there is going to
be an earthquake and some guy is going to give you theRainbow Wing.
Good Luck!!!!!!!!!!!!!!!!!!

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