You can trade, use the action replay for Pokemon Platinum, or actually catch it without the action replay. If you have completed the Sinnoh Pokedex, go and see Professor Rowan, and he will give you the National Pokedex, then you catch all the Pokemon throughout the land of Sinnoh from all the other regions due to an "outbreak". But, where to catch caterpie specifically, you need to go to Eterna Forest, west of Eterna City.
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find a caterpie in eterna forest then level it to level 7 and it will evolve into larvitar
Caterpie can evolve into metapod starting at level 7. The evolution conditions for caterpie are not different in Pokemon Yellow from other pokemon games.
Caterpie
Caterpie evolves into Metapod, starting at level 7, then Metapod can evolve into Butterfree at level 10.
Spinarak, heracross, weedle, caterpie.