Alola starters are currently marked as legal if bred in any ball available in SM, pretty sure they can't be caught in the wild so they should be illegal in anything other than a regular Pok茅 Ball.
You can breed it with another female pokemon having a different ball and it would then inherit the female parent's ball so it's possible.
edit: my bad. sorry about this comment.
@bengeminuy the baby will be the same mother's species, never the father's... so, 7潞 gen starters can't have special balls, only pokeball -_-
@lomejor18 But males can now pass down balls, so you could breed a female Gen 7 starter with a male of another species that is compatible, and potentially end up with a different ball. So I don't think this is a bug at all.
Here's the rule of ball passing in gen 7
There is 50/50 split of passing the ball down only if the parents are the same species.
If one of the parents is a Ditto, the non-Ditto parent will pass down their ball 100% of the time.
If two different species are breeding, the mother will pass down the ball 100% of the time.
so based on this, i think it's still impossible to have gen 7 starters in any ball other than regular pokeball.
Pretty sure Popplio is usually male anyway, as well as the others only most of the time being female.
@TCJJ @lordxiad look, as @kamuisama said, male pass pokeballs only with ditto and same species female, the child always will be the same of the mother's... EX: Male popplio + Female Squirtle = baby Squirtle
by the way @kwsch, i believe that fossils can not be on special balls, only pokeball (until pokebank's release on january)
@lomejor18
Seems like many PKHex users have never bred a pokemon themselves :D
Looks like you guys are correct. Shouldn't brain that late at night. Here's some detailed information (though not sure why anyone would care about the Pokeball anyway): http://www.neoseeker.com/forums/90765/t2223390-sun-moon-breeding-guide/
wow seems gen7 made some big changes with the breed mechanism, children have a chance to inherit ball types from both parents now instead of only mothers in previous generations.
So, I still have a question, how about the non-gender like Beldrum? Is there a way to inherit ball type?
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@lomejor18
Seems like many PKHex users have never bred a pokemon themselves :D