Croagunk is not available in the Pokemon SoulSilver/HeartGold games. Actually, it is. You must put forest objects in the marshland area of the safari zone. I don't know how many though.
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You can't catch charizard in Pokemon soul silver. You can get a charmander from professor oak.
sorry you have to trade it to Pokemon soul silver
No
you cant catch it in soul silver.
you can catch it outside the safari zone