Given the generation mentioned: Diglett is the smallest Pokemon. Catepie is currently the 11th Smallest Pokemon (along with 41 others.)
To date: It's Joltik or the newly announced Flabébé.
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caterpie evolves into metapod by leveling, not by a stone
Caterpie evolves into Metapod, starting at level 7, then Metapod can evolve into Butterfree at level 10.
Caterpie evolves into a Metapod, Which then turns into a Butterfree at level 10.
Caterpie can evolve into metapod starting at level 7. The evolution conditions for caterpie are not different in Pokemon Yellow from other pokemon games.
No, butterfree does not evolve. Butterfree is the last stage evolution of caterpie. Caterpie, Metapod and then Butterfree.