This gift was distributed to commemorate the release of Pokemon Ultra Sun and Ultra Moon, as well as to celebrate Pokemon Movie 20: I Choose You.
This Pikachu was distributed via QR code, similar to how Magearna was given away during the launch of Pokemon Sun & Moon.
It appears that this distribution does not yield any guaranteed IVs.
It's nature is locked to Hardy. Due to a glitch, as long as you don't have the Trainer Shiny Value (TSV) of 1009,
there is a chance of receiving this gift shiny (standard odds, unaffected by shiny charm).
The item Pretty Wing alludes it holding Ash's Rainbow Wing,
as depicted in the Ga-ore card, and the Pokemon TCG card that was distributed as part of the promotion.
The details below refer specifically to this file.
Format Ver.1.0.5-5, Post Updated Date:20171120_0134