Best Regional ______?

[Bolt the Cat]

You forgot early Electric and Regional Two Staged Fish :P

Regional Two Staged Fish is too general a category, which families are you referring to?

Also, I say Emolga for the regional Electric rodent (that'd be Pikachu, Pichu, Plusle/Minun, Pachirisu, and Emolga).

[remybutton]

For bird, it's the Starly line since I find that the most useful. As for rodents, I'm not too fond of any of them but if I had to choose one, it would be the Poochyena. The Sewaddle line would be my choice of bugs.

[Nacreous]

Starly,Sewaddle,Taillow.

[Epic-Inferno]

Starly, Sewaddle, Zigzagoon.

[VioiV]

Tailow or wingull (Both really good)
Definetly Zigzagoon (Pickup ability)
Maybe then Wurmple (I like both Dustox+Beautifly!)

[cc_aussie]

Kanto:
Pidgey/Spearow
Rattata
Caterpie/Weedle

Johto:
Pidgey/Spearow/Hoot-Hoot
Rattata/Sentret
Caterpie/Weedle/Spinarak

Hoenn:
Taillow/Wingull
Zigzagoon/Poochyena
Wurmple

Sinnoh:
Starly
Bidoof
Kricketot

Unova
Pidove
Patrat/Lillipup/Purloin
Sewaddle/Venipede

it's actually:

Kanto:
bird: Pidgey
rodent: rattata
bug: caterpie/weedle

Jotoh:
bird: hoothoot
rodent: sentret
bug: dont think there really is one but i think its supposed to be spinarak/ledyba

Hoenn:
bird: taillow
rodent: zigzagoon
bug: wurmple

Sinnoh:
bird: starry
rodent: bidoof
burmy

Unova:
bird: pidove
rodent: patrat
sewaddle

[your boss]

Bird: Starly/Tailow
Rodent: Zigzagoon
Bug: Spinarak and Sewaddle

[Exeggudork]

Bird: Wingull or spearow
Bug: Sewaddle
Rodent: Raticate or Bidoof