I was looking on the wiki and it said that there are different
messages to show when Pokémon are compatible in the daycare. Right
now my Pokémon are "The two seem to get along very well" and I was
wondering how I could get that to "The two seem to match
perfectly".
IIRC, there are two things that make Pokémon more or less
compatible: Species and OT. If they’re the same species, that makes
them more compatible, and if they have different OTs, that also
makes them more compatible. So you should get the perfect message
if they’re the same species and they have different OTs.