Cerabi isn't a real Pokemon. You may be referring to Celebi, which can only be obtained by events. You may also be referring to Cherubi, which may be found if you play Sinnoh music or by trading from another game.
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No, you can not catch Phanpy in SoulSilver. It is a version exclusive to HeartGold.
you cant catch it in soul silver.
you can catch it in your pokewalker in the refreshing feild ruite.
With a pokeball
Viridian Forest.