chase it then you can catch it find out where it goes on seribi.net
yes
Where you find Misty.
You can catch Suicune at Kanto Route 25. If you run away or Suicune faints you can have a rematch at the Burned Tower.
yes
Suicune is at Level 40 in HeartGold and SoulSilver.
LVL 50
On Cerulean Cape
there isn't a wild suicune to catch in white or black
after that, someone at the battle frontier will tell you about latias and latios. then, latias will start roaming kanto.
Ho-Oh Lugia Suicune Articuno Zapdos Moltres Mewtwo Kyogre Raikou Entei Latias
one and one only
No