"Underused." Basically, Pokemon that aren't used in most tournaments because they either have (mostly) poor stats, crappy movesets, or easily-exploitable weaknesses.
Venosuar here looks like one of the Colosis from Shadow of the colosis. Not the fur and buildings parts, but the size and the badass terror they carry with them.
I imagine when they run out of colors to call Pokemon games, someone will pick up the title and create a realistic Pokemon. I mean... we've seen enough variations out there.