How to obtain.

Interested in having a Pidgeot of your very own? Then look no further! Although Pidgeot itself cannot be found in the wild its previous evolutions––both Pidgey and Pidgeotto––can, so it would be a good plan to catch either one of those and level them up so it'll evolve into Pidgeot. To get yourself started here is a complete list of all locations where you can find Pidgey and Pidgeotto.

Red/Blue:
Pidgey Locations: Routes 1, 2, 3, 5, 6, 7, 8, 12, 13, 14, 15, 21, 24, and 25.
Pidgeotto Locations: Routes 14, 15, and 21.

Yellow:
Pidgey Locations: Routes 1, 2, 5, 6, 7, 8, 11, 12, 13, 21, 24, and 25, Viridian Forest.
Pidgeotto Locations: Routes 5, 6, 7, 8, 11, 12, 13, 14, 15, 21, 24, and 25, Viridian Forest.

Gold/Silver:
Pidgey Locations: Routes 1, 2, 5, 25, 29, 30, 31, 32, 34, 35, 36, and 37, National Park.
Pidgeotto Locations: Routes 2, 8, 13, 14, 15, 25, 37, and 43.

Crystal:
Pidgey Locations: Routes 1, 2, 5, 25, 29, 30, 31, 35, 36, and 37, National Park, Ilex Forest.
Pidgeotto Locations: Routes 2, 5, 8, 11, 13, 14, 15, 25, 37, 38, 39, and 43.

Ruby/Sapphire/Emerald:
Pidgey Locations: Trade from FireRed/LeafGreen.
Pidgeotto Locations: Trade from FireRed/LeafGreen.

FireRed/LeafGreen:
Pidgey Locations: Routes 1, 2, 3, 5, 6, 7, 8, 12, 13, 14, 15, 24, and 25, Bond Bridge, Berry Forest, Five Isle Meadow.
Pidgeotto Locations: Routes 13, 14, and 15, Bond Bridge, Berry Forest, Five Isle Meadow.

Colosseum:
Pidgey Locations: Trade from FireRed/LeafGreen.
Pidgeotto Locations: Trade from FireRed/LeafGreen.

XD:
Pidgey Locations: Trade from FireRed/LeafGreen.
Pidgeotto Locations: Cipher Key Lair (Shadow).

Diamond/Pearl:
Pidgey Locations: Route 229 (Swarm).
Pidgeotto Locations: Evolve Pidgey.

Platinum:
Pidgey Locations: Route 229.
Pidgeotto Locations: Evolve Pidgey.

HeartGold/SoulSilver:
Pidgey Locations: Routes 1, 2, 5, 6, 25, 29, 30, 31, 35, 36, and 37, National Park, Viridian Forest.
Pidgeotto Locations: Routes 2, 8, 13, 14, 15, 25, 37, and 43, Viridian Forest.

Black:
Pidgey Locations: Trade with White.
Pidgeotto Locations: Trade with White.

White:
Pidgey Locations: White Forest.
Pidgeotto Locations: Evolve Pidgey.

Black 2/White 2:
Pidgey Locations: Trade with White.
Pidgeotto Locations: Trade with White.

X/Y:
Pidgey Locations: Routes 2 and 3, Friend Safari (Flying).
Pidgeotto Locations: Evolve Pidgey.

Omega Ruby/Alpha Sapphire:
Pidgey Locations: Breed Pidgeotto or Pidgeot.
Pidgeotto Locations: Safari Zone (DexNav).