Considering Peter has walked away from each fight while Ernie lain beaten and bloody, and considering he's the main character on the show, Peter would ultimately win.
Mia dumps Peter in the first episode of season 9
Why We Fight - Jericho episode - was created on 2007-05-09.
Gray and Lyon fight in episode 15 on Galuna Island.
Episode 35.
because the chicken gave peter an expired coupon as seen in the y2k episode
A giant chicken (rooster)
There hasn't been a "final showdown" yet. Ernie's most recent bout w/ Peter happened in the last episode of Season 10, Internal Affairs.It was suggested there might be another fight in the Family Guy/Simpsons crossover episode that is apparently slated to air in the Fall of 2014, but that may have been a joke told by Steve Callaghan.
New Kidney in Town
Aired on November 27th 2011, Season Ten Episode Seven, the appropriately named, Amish Guy
No such episode exists that matches that exact description.The only episodes that come close are the one where he's jealous of Chris' endowment, that's And the Wiener Is & the other is the short fight they get in when Chris stop Peter from bullying, and that was Tan Aquatic of Steve Zissou
Episode 12 of season 3 of How it's Made had the episode of chicken where they discusses the process of chicken and chicken products. They also talk about the process of chicken nuggets.
they never fought on degrassi but it one episode she was mad at peter for wanting to go to Kenya with Darcy
Peter Kay was in the episode Love & Monsters.
Episode 251 The tale of 2 warriors (this is the episode the fight starts)
Since Ernie & Peter were a tie in their fight & since Joe beat the snot out of Peter, Cleveland, & Quagmire combined Joe would do the same with Ernie.
Considering Peter has walked away from each fight while Ernie lain beaten and bloody, and considering he's the main character on the show, Peter would ultimately win.