after you get to vermillion city go past digletts cave and go into the grass and look down there should be a opening and go in there and carry on suicune is at the end of the path
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Beat misty then go to cerulean cape
After Mount Mortar, Suicune will travel to Kanto where you will see it Vermillion City shortly after you arrive on the SS Aqua.
You will first see Suicune in the north of Cianwood City.Then you will find it next to the entrance of Mt. Mortar,then it will head to Vermillion City in Kanto,after that you will find it on route 14,and finally you will be able to capture it on the edge of route 25.
North of Cianwood City ( Kanto ), outside of Mt. Mortar in route 42 ( Kanto ), Vermillion City ( Johto ), Route 14 ( Johto ), then you find it for the last time in route 25 ( Johto ), where you will face it.
you can get him by taking the s.s aqua to vermillion city then you will see suicune run from you when you docking to vermillion city then go west then steven the hoenn champion will tell you latios is running around on your pokegear map then you will see latios`s head all over kanto region running away from you its just like Entei, Suicune,and raikou did I HOPE I HELPED