Actually, Gourgeist isn't half bad in VGC. I've used one before, and seen it do some crazy stuff as well. Mostly for it's Frisk which is invaluable for scouting items.
Although you're using this 'mon a... little wrong, if you don't mind my saying it. Your team looks very little like a TR team, only Conk particularly enjoys it. Are you really keen on running TR with it? If no, try throwing in Protect an attacking move instead of Trick-or-Treat (maybe Shadow Claw).