Forum Thread

As I understand it, there are only two things that affect how compatible Pokémon in the daycare are: Their Pokédex number and their OT.

And megas have the same Pokédex number as their regular forms.

But I’ve put a male mega and a female non-mega of the same species and with different OTs in the daycare, and I’m only getting the "The two seem to get along very well." message, not the "The two seem to match perfectly." message.

So, am I missing something? Is there something else that affects how compatible they are?

They have to be the same species, not have the same Pokedex number. On this site, Megas are considered a different species to the base Pokemon, which means they are not compatible.

(There is actually another thing that affects compatibility: whether the Pokemon are siblings or not; if one of the parents [of the Pokemon you're using to breed] is the same, then you'll get the message "The two seem to play with each other, but only as brother and sister")

Oh, I could’ve sworn I saw someone specifically say that they need to have the same Pokédex number for the compatibility boost. I remember thinking it was weird that they said that instead of just saying they need to be the same species. I wouldn’t know how to find that post now, though.