Caterpie can evolve into metapod starting at level 7. The evolution conditions for caterpie are not different in Pokemon Yellow from other pokemon games.
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Caterpie will evolve into Metapod starting at level 7, and Metapod will evolve into Butterfree starting at level 10.
Caterpie evolves into Metapod, starting at level 7, then Metapod can evolve into Butterfree at level 10.
LVL 7
At level 10 from Metapod. It is the final evolution of Caterpie.
find a caterpie in eterna forest then level it to level 7 and it will evolve into larvitar