You'll need to use Surf when you go straight from Ecruteak City. Once you used Surf there'll be a little land and head straight, then upwards and use Cut in that little tree where the 3 Apricorns Trees are. Suicune will be there, but ends up running away again.
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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.
go through route 42
a hiker on route 42 will give you the tm strength. use that on the boulders
National Park (1st prize), Route 42 (PokeGear Phonetical), Route 25 (Show Bill's grandfather a Staryu), and Seafoam Islands.
you can get shadow claw on the goldenrod lottery on mondays as first price. and at route 42. hope this helps!