I haven't had a gold sale ever on DS! I play several S8 games, and they do not offer me the gem/gold sales, either. (Well, I've had one or two Black Friday-type sales in FFS over the years, but that's it.) I'd be thrilled with a monthly sale. I do feel your frustration, though... It's no fun hearing about frequent sales, is it?
As for the topic of this thread, I'm super, crazy-excited about this Valiant Dragon! I will do everything I can to breed this amazing dragon! I can only assume he'll rule the battle arena!
For those who don't have a diamond, do keep trying. It took me a long time, but it just made it that much sweeter when I got it! Just be sure to have 4 different types in the breeding den (whenever possible) since you never know when your luck will strike!
Good luck breeding Valiant, everyone! Fingers crossed for those hoping for their first diamond, as well.