I hatched Anconas for the first time this year. I only have black and 1 brown hen and 1 brown drake. Out of my batch I got 3 tricolors. And then I got this guy. What color Is he called? My Anconas are by themselves so they don’t intermingle with my other ducks.Pardon the slow reply!
So, Chocolate is its own gene. To get chocolate, you must already have chocolate.
Your lilac/lavender hen is Chocolate - that's what those colors are, chocolate plus one or two copies of blue. So, her sons will all carry one copy of chocolate. None will express it.
You can use those sons to breed more chocolates. By breeding back to their mother, you could get chocolate/lilac/lavender ducklings in both genders.
If instead you breed them to an unrelated female that is not chocolate, half the female offspring from that breeding would be chocolate, and half the male offspring would be carrying chocolate.
On the buff front, buff is also its own gene. It too is sex linked, so it breeds just like chocolate.