Analysis of the Pokemon Bank gift format shows that it holds WC6FULL files, and can hold up to 6 of them.
The remaining 3, while having it's species dummied out, actually holds data:
Format Ver.1.0.8-2, Post Updated Date:20190622_1711
What's interesting with the information above is:
1. OT is Satoshi (ASH)
2. All Distribution titles (including for the Regi's) is "Zekrom Present"
3. Fusion Bolt and Haze, are both moves associated with Zekrom (or more specifically, Ash's Zekrom)
4. The inclusion of Light of Ruin and Fairy Gem
Speculating on what the leftover data means:
The data suggests that Ash's Zekrom was initially used for testing,
but the changing of the first move to Eternal Flower Floette's signature move and the inclusion of the Fairy Gem,
hints that Eternal Flower Floette could have been the second round of testing, before getting the Species and Forme data wiped out.
As such, I'm also attaching a modified wonder card to showcase the Eternal Flower Floette.
This Pokémon was first seen as a sketch in AZ's flashback, and later seen as a 3D model after that battle with Pokemon Trainer AZ.
Since then, it was discovered to be a Pokémon with fully programmed data, however was never released to players.
Besides Pokémon X&Y, the data for this Pokémon exists in Pokémon Omega Ruby & Alpha Sapphire, Pokémon Sun & Moon, Pokémon Ultra Sun & Ultra Moon
and also Pokémon Let's Go Pikachu & Eevee (while the species was not available, the data is in the personal_info narc).
Additionally, I also attached a slightly recreated Ash's Zekrom; an re-imagining of the first debugger gift format.