Edit: I'm sure someone said Ursaring for Russia earlier... not sure why that hasn't been added to the list, it is a perfect match.
Any frog pokemon and Magcargo for France. We know how the French love to eat frog's legs and snail shells xD (I hope I don't offend any French members with this, it's not meant to be an insult). Magcargo's name does come from Escargo.
What about Escavalier also for Italy (with the Krows)? Gladiators/Centurions are from Rome. Its design is based off Roman soldiers' armour/style.
Sigilyph for Peru. It's based off the famous Nazca lines (the Hummingbird specifically, iirc).