In SoulSilver, even if you defeat the snorlax without capturing it, it will reappear after you defeat the Elite Four, so you don't have to worry about not being able to catch it later on.
Whether snorlax is a good Pokemon or is a good addition to your team is a different story. Snorlax is a pretty powerful Pokemon that can both take hard hits and dish them out. However, as a normal type, the moves it learns by level do not have terrific type coverage.
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You Have to get a Munchlax Evolve it and Bam! you got A Snorlax.... :D
Yes, you can, but the success rate is very low, since the Snorlax is on Level 50.
Try snorlax he is fat
Snorlax is in two locations to the west of celadon city and to the east of vermillion city just use the pokeflute to wake it up. Didn't catch it? Get the purified snorlax from Pokemon xd gale of darkness.
Go to the place where a sleeping pokemon/snorlax is blocking your way then play the flute, snorlax will be awaken then fight it then catch it