Hey there,
I'm very interested in getting a Diancie and Hoopa off of you. I am sadly lacking in competitive legendaries and shinies, but I do have several 6IV HA breeders that might interest you:
Abra w/HA (Magic Guard) and Egg Moves: Barrier, Thunder Punch, Ice Punch, Knock Off
Eevee w/HA (Anticipation) and Egg Moves: Covet, Wish, Synchronoise, Stored Power
Arcanine w/HA (Justified) and Egg Moves: Thrash, Flare Blitz, Close Combat, Body Slam
Venusaur w/HA (Chlorophyll) and Egg Moves: Sludge, Petal Dance, Giga Drain, Skull Bash
Charizard w/HA (Solar Power) and Egg Moves: Flare Blitz, Dragon Pulse, Outrage, Crunch
Blastoise w/HA (Rain Dish) and Egg Moves: Muddy Water, Brine, Mirror Coat, Aqua Ring
Nidoran (F) w/HA (Hustle) and Egg Moves: Poison Tail, Skull Bash, Iron Tail, Counter
Scizor w/HA (Light Metal) and Egg Moves: Bug Buzz, Counter, Night Slash, Razor Wind
Camerupt w/HA (Anger Point) & Egg Moves: Body Slam, Ancient Power, Heat Wave, Mud Bomb
Gengar with Egg Moves: Ice Punch, Fire Punch, Clear Smog, Thunder Punch
Gyarados w/HA (Moxie)
With the exception of the Abra that's Kalos bred by me the others would be copies of my own breeders, in case that's an issue for you. Please let me know if any of these appeal to you, I'd be happy to trade more than one for each legendary.
Also, even if we can't work out a deal for the Diancie and Hoopa, would you be willing to part with a female HA 5-6IV Skrelp with egg moves?