It evolves into a Polywhirl at Level 25, and then to a Polywrath when given a water stone.
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poliwag evolves at leve 25 into poliwhirl..veronica
You can't catch wild Poliwhirl. You catch Poliwag though. Evolve your cute Poliwag into Poliwhirl by using a water stone. You can probably buy water stones in the department store in Celadon City.
Spearow evolves at level 20 in Pokemon Yellow.
Caterpie can evolve into metapod starting at level 7. The evolution conditions for caterpie are not different in Pokemon Yellow from other pokemon games.