At what level does Spearow evolve?

Spearow evolves into Fearow at level 20. Both levels of the Pokémon are of the same type. It also sees very large increases in its base stats when it evolves.

Both Spearow and Fearow share several innate abilities, such as "Keen Eye" and "Sniper." The "Keen Eye" ability grants this Pokémon line immunity to moves that lower its accuracy. It also ignores moves that increase the evasion of the opposing Pokémon. The ability "Sniper" causes all critical hits to deal 225 percent extra damage instead of the normal 100 percent damage bonus. This is especially useful against battling grass, bug or fighting type Pokémon, as they are weak against flying type moves.