The following translation comes from AwesomePahsome on Reddit...
Pokémon Mystery File
A world of Pokémon you don't know
Is this a time slip? Is it manipulating time? It came from the moon? Is it a space virus? Is this an encounter with aliens?
Thank you. With the power it has received from your Solrock it looks like it can return home... to the sky! Is this a UFO appearance? Is this an alien invasion?
The battle with the alien invader has begun! Is this the underside of this world? Is this a puzzle of ancient relics? Is this an attack from a parallel universe? Is it possessing humans?
Written in Unown
Is something happening?
Even with the description, all this is still confusing! Pokemon Co. disabled the comments on the video as well. Seems like they're being mysterious on purpose!