It sure is weird they had video cameras in ancient times in the Pokemon world.
^This. A thousand times, this.
I don't know if they're just trying to tease Legends or some lost part of the Hisui Region that wasn't there in the original Sinnoh games, but might be in BDSP. The person calling it a "mysterious device" points to the former though.
To speculate, I have to assume it's Hisuian Arcanine.
Edit: I'm basing this on the white fur which Hisuian Gowlithe has, the red-tipped tails which suggests fire typing, and the person being surprised the Pokemon would be around such a cold area which would jive with it being a fire type.