Update on my challenge: I've incorporated a 1-time mercy ruling for my experience, so half of my current team is on its last leg. Training for Clement in Lumiose and half of my team is lvl 37 and the other half is 38, so he shouldn't be a problem.
My team and their standings are:
Petrie the Aerodactyl - Pressure/Tough Claws - lvl 37 - Naughty nature - Rock Tomb, Bulldoze, Fly, and Crunch. Last Leg
Ketchup the Raichu - Static - lvl 37 - Gentle - T-Bolt, Strength, Rock Smash, and Dig. Last Leg
Daisy the Florges - Flower Veil - lvl 37 - Lax - Fairy Wind, Return, Petal Blizzard, and Grassy Terain.
Foxy Dude the Delphox - Blaze - lvl 38 - Bashful - Mystical Fire, Thief, Psybeam, and Power-Up Punch.
Sawyer the Venusaur - Overgrow/Thickfat - lvl 38 - Bashful - Razor Leaf, Bulldoze, Venoshock, and Growth.
Aquarius the Simipour - Gluttony - lvl 38 - Docile - Surf, Shadow Claw, Acrobatics, Power-Up Punch. Last Leg