There are many ways to obtain starters in different Pokéballs. There have been several events distributing special ball starters (such as luxury ball Cyndaquil)Starters in other balls are hacked, right? Because I got a Charmander in a Repeat ball on Wondertrade. Or is there a way to get starters in different balls?
But this Charmander is very likely to have ended up in a Repeat Ball because its mother was caught in said ball in a Friend Safari
Look around on this page of our lovely website to find all the Pokémon available through FS, who are therefore catchable in any Ball available in XY
Derp me. I completely forgot about Friend Safari. Your explaination makes sense, thanks