you couldn't get duplicate moons before post game (which would be "outside the dump")

just don't buy more than one moon in a single shop, then you'll be fine

Does anyone know if talkatoo can say painting moons (at any point, idc if it’s after peace, post game, or never)

Probably too similar to modern any% route except for cascade (which would become 3 capture route) and snow kingdom (which you'd just get every non story moon you'd need)