i would think it be the same as the original silver and gold and that would be to the left or straight down from were the tower is
to find suicune go to curelean city towards route 25. it'll be standing there waiting. Entei, Raikou. Roam around
On Cerulean Cape
Where you find Misty.
You must chase Suicune around until you finally find him at the place where you first find Misty.
You need to have defeated Misty before you get Suicune
Suicune is at Level 40 in HeartGold and SoulSilver.
You find Suicune at Ceruluean Cape.
suicune is on the right side somewhere on route 14. after encountering suicune there, if you met misty at the end of route 25, you'll find suicune there and you can battle it.
You can find Suicune, as well as Riaku and Enti on the bottom floor of the Burned Tower. Hope that helped! :)
Cerulean Cape after finding him on other routes.
chase it then you can catch it find out where it goes on seribi.net
Olivine town, Outside Mt motar, Vermillion city then Cerulean cape