Do pokemon actually lay eggs? Or is that just bird/reptile/fish like pokemon? Do mammalian pokemon give live bvirths?

With the exception of legendary pokémon, all known species lay eggs—and the legendaries are only an exception because we don’t actually know how they reproduce.

For this reason, most mammal-like pokémon have more in common with monotremes like the platypus than they do with their “animal counterparts,” as it were.