I mean, I'm pretty sure you can breed charmander, bulbasaur, and squirtles (to their own kind, not each other).. And they're supposed to be the "child" version by evolution standards
pokemon breeding is a lootttttttttt more complicated than it needs to be.
there are 15 egg groups and everything within its own egg group can breed with anything else in its own egg group, then a lot lot lot lot of complicated rules and variables to keep track of that affect the end result.
All that to say, the "child" versions of the pokemon can breed with other pokemon in their own evolutionary line and other "similar-ish" pokemon
Lol I only vaguely remember in Pokemon silver you stuck two appropriate gendered Pokemon in the daycare and came back awhile later to find out if they hated each other, or made babies
yeaaaaaa, i never really got the breeding stuff myself.
i had to google how many egg groups there are, before doing that my knowledge of how breeding works in pokemon could be summed up as like
"a more obsessed friend once talked about egg groups and breeding only works within an egg group like 10-15 years ago and vaguely recall that there were a lot of things he said you needed to account for to get a good pokemon out of the egg"
there are 15 egg groups and everything within its own egg group can breed with anything else in its own egg group, then a lot lot lot lot of complicated rules and variables to keep track of that affect the end result.
All that to say, the "child" versions of the pokemon can breed with other pokemon in their own evolutionary line and other "similar-ish" pokemon
i had to google how many egg groups there are, before doing that my knowledge of how breeding works in pokemon could be summed up as like
"a more obsessed friend once talked about egg groups and breeding only works within an egg group like 10-15 years ago and vaguely recall that there were a lot of things he said you needed to account for to get a good pokemon out of the egg"