What is the duo of Pokémon that least seems like they should be able to breed but can? [closed]

Question

It seems kinda funny that Pokémon in the field egg Group, such as Cacnea and Magmar, can breed. Can someone make a comprehensive list of these Pokémon?

Comments

I think this is a bit too trivial/subjective personally.

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^^ This is WAY too subjective lol