You have to catch an Ariados in route 229 an breed it and a spinarak will comme out from the egg
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Spinarak is a Heart Gold Pokemon not a Soul Silver Pokemon, You'll have to trade it.
Spinarak evolves at level 22 in to an ariados.
Nowhere. Spinarak are on Route 30 in HeartGold ONLY! YOU NEED TO TRADE!
because its a pokemon, and no one cares
Spinarak, heracross, weedle, caterpie.