Inside Tin Tower after:
Released the 3 dogs from Burnt Tower
Met the guy in the path to Tin Tower
Obtained the Clear Bell from the Radio Tower (After defeating Pryce)
Chat with our AI personalities
no
You can get lugia, ho oh, entei, suicune and raikou
the legendaries available in Crystal is Raikou, Entei and Suicune. Lugia and Ho-oh are available too.
suicune is top legendary dog just play Pokemon crystal and you'll see.
The most important pokemon to catch in any game is its mascot, in this case Suicune.