Well, it would depend on which game you're trying to catch a Suicune in. If you are trying to catch a Suicune, let's say, in Firered Version, once you encounter him, it would be a good strategy to buy a bunch of ultra balls and repels. Go to a route and save your game. Turn off your game and turn it back on. Check your map to see if Suicune is in that route. If he isn't, repeat the process by turning the game off and turning it back on. It may take a while, but continue to do this until Suicune is in your route. Good luck!
there isn't a wild suicune to catch in white or black
yes
You can get any starter to catch Suicune.
Use a Master ball on Suicune but there is an easier way get Suicune. Catch a Pokemon who has the ability of spell tag.
Suicune is a hard Pokemon to catch Suicune will move around diffrent places. You normally catch Sucune at level 40 use your map to try and find Suicune on your pokegear. It is hard but you will get there
You can catch Suicune at many points in the game. It depends on when you caught it. It is impossible to say what you must do next.
you cant...sorry
yes
Do a celebratory dance.
suicune
yes
You cant