Personally, I think Pidgey's are way better. They are easier to find, have better moves and more evolutions.
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A Pidgey will be more worth even if it is hard to raise
Spearow evolves at level 20 in Pokemon Yellow.
you cant find a pidgey in Pokemon emerald the only way to get a pidgey is to trade with Fire Red or Leaf Green
SPEAROW Evolves at LVL 20.
Pretty much any Pokemon with wings, i don't know them all but i can make a list of ones i know: pidgey Venomoth spearow Pidgeot butterfree Pidgeoto beedrill *maybe Scyther*not sure* fearow farfetch`d Ho-oh lugia