Mythic sightings?

anyone here into mythic hunting? had any encounters yourselves? i'll go first:

so i'm a bit of a spelunker, and last time i was in the Alola region i SWEAR i saw a marshadow


sorry for the bad pic i kept getting attacked by diglets -_-

it disappeared like right after i snapped this but i KNOW i saw something. what do you guys think? could it actually be a marshadow or is this just wishful thinking