you travel the map and find it in unusual secluded places until
you go to cerulean city after beating misty and it will be in the
place where you find misty at first with her boyfriend
How do you get suicoon in Pokemon HeartGold?
Please see the related link below.
Catching Suicine in SoulSilver is the same as catching it in
HeartGold.
Where do you find suicine the first time?
in pokemon heartgold soulsilver games at burnt tower
Where is suicine in Kanto on HeartGold?
right next to someones house in the gate with the trees up
above.
How do you recruit suicine in Pokemon Mystery Dungeon blue?