Pokemon Silver Für Visual Boy Advance How Can I Catch Suicune In Pokemon Silver?

How can I catch Suicune in Pokemon silver? - pokemon silver für visual boy advance

I just played Pokemon Silver, and as I walked by a little grass which I can Suicune! I know it was a rare Pokémon, because he was level 40, but fled when he tried to take action. Will I be able to at least one catch? How can I join in it?