Mr.Munchlax
Great Ball Rank Trainer
Personally, I’m not 100% convinced that Farfetch’d & Ponyta are specifically each other’s version counterparts since they don’t have any common or polar opposite traits like the ones in the examples (except for the fact that they’re from Kanto).I don't know if they were referred to as such but absolutely.
Alolan Vulpix Line - Alolan Sandshrew Line
Oddish Line - Bellsprout Line
Mantine - Skarmory
Lunatone - Solrock
Sableye - Mawile
Glameow Line - Stunky Line
Gothita Line - Solosis Line
Skrelp Line - Clauncher Line
Buzzwole - Pheromosa
If I had to guess, Farfetch’d’s counterpart is either a bulky dragon or a fighting type that has something implying a big shield to go with Sirfetch’d’s knight & lance influences. In contrast, Ponyta’s counterpart will probably be a horse (or horse-like animal) that’s more of a physical attacker & speed since Rapidash will most likely have a high special attack and defense.