once you have defeated the elite four your mother says to go to professor Elm. He will give you a S.S. ticket to vermilion city. He will say go to Olivine town to go on the boat. Once you go to the boat stop, Professor Oak will give you the national dex. Then go on boat and this guy will tell you to find his daughter. Go find here. then you play hide and seek with her. When you find her, you will go to the guy. Then go out of the boat and you will see suicune. If you don't you didn't see him in route 42
in the cerulian cape after seeing him at virmillion and this place with windmills near fuschesta
go to virmillion city. the place where SS anne is
Suicune should be on the water when you arive from the boat to vermileon city.
You first find suicune at cianwood city. Then at Vermilion city. then at rout 14. you fight suicune at route 25
in the water at 3.00pm
suicune apears at the port in vermillon city and later at route 14 and at last go to route 25 and catch suicune
Wodonga fool
at olivine city
you see suicune on the route to mohogany town you have to use cut to get to it please recommend (if it helps) =]
Go to Fuchsia City and then to Route 15 (If you have already seen Suicune on the water just fly to Cerulean City). Next go to Route 25 and (if you have already fought her) go to where you found Misty. Then you will see Suicune and Eusine will come and talk to you. After that just talk to Suicune and battle it.
After you beat all of the kanto gyms, go to cerulean city and go to where you saw misty with her "date". Suicune will be waiting there.
once you get to the kanto region, suicune is waiting for you near bill's old house, north of cerulean city