somewhere
You go to a mountain and catch raikou
Raikou is not available in Pokemon Red as it was introduced in Gold and Silver.
raikou,suicune,entei
suicune, entei, raikou, and ho-oh
No, raikou cannot be evolved, because he's a legendary pokemon.
You transfer it from Heart Gold or Soul Silver.
A place where you first meet Raikou, Entei and Suicune
In Pokémon Gold for the Gameboy Color, the Legendary Pokémon that were available are Entei, Raikou, Suicune, Lugia and Ho-Oh.
In Pokemon Soul silver or silver or gold, the legendaries you can get is Lugia, Suicune, Entai, Raikou, Mew and Mew 2
For starts, it's Entei, Suicune, and Raikou, and you can't. They're Heart Gold-only Pokemon.
Wrong game dude. You're thinking of crystal, gold and silver.
Waiting in the new Soul Silver or Heart Gold for you to catch it.