If you chose charmander as your starter beat the game and get the national dex plus deliver the ruby and sapphire to celio then go to route 1 once you find it use the masterball on it to get it.
If you ever happen to see it but forget to catch it or you own a suicune thanks to a friend giving it to you you can use the pokedex to check where it is but it ALWAYS moves so the best spot to be in is at route 1.
You can approach them and see if they want to battle.
suicune is located in the kanto region by the cerulean gym by billys house after you see billy you will see suicune by the gate.
You see Suicune level 50.
you see suicune on the route to mohogany town you have to use cut to get to it please recommend (if it helps) =]
You have to find Suicune in its other locations. Eugene gives you hints as to where Suicune will be next. You have to remember what Eugene last said to you when you last saw Suicune.
Suicune always changes locations you should be able to see where it is on your map
After Mount Mortar, Suicune will travel to Kanto where you will see it Vermillion City shortly after you arrive on the SS Aqua.
To get Suicune first you will see it north of Cianwood City, then you will see it outside the entrance to Mt.Mortar in Route 42. After that you will see it in Vermillion City, then route 14. Only after Misty has returned to her gym you will fight Suicune on Route 25 outside of Bill's House.
you have to beat red in mt. silver then you can see suicune at curelan
you can find suicune anywhere when you have the national dex.Use a masterball to catch it, becareful it will run away when you tackle it. good luck A location i usually found suicune was on route 4 near mt moon and an easy way to find it cut the grass and leave one patch of grass stand near it and use sweet scent and go into the grass after trying that several times if it doesn't show up don't forget its legendary, also if you own a suicune from getting it in a trade you can see exactly where it is on your pokedex.
in leaf green , viridian woods