Well, this time round, Clair.
My highest levelled pokemon was Explotaro (lv.47 Typhlosion). Luckily, her Gyarados didn't knock Ambipom out before it passed 2 agilitys to my Sudowoodo, who took out all but Kingdra with Life Orb-boosted STAB Rock Slide.
Sudowoodo actually took on all of Lance's team, with sleep support from Politoed, bar Gyarados, who was stalled out by Sunflora, somehow.
But Kingdra was horrible. In the end, I switched Politoed in on a Hydro Pump intended for Typhlosion, healing some hp, survived a Dragon Pulse, hit it with Hypnosis, switched out, Sunflora Leech-Seeded, used Sunny Day, switched for Ambipom, who passed Agility boosts to Typhlosion, who got hit by a Dragon Pulse, leaving him with 1 hp, but somehow got a through a 4x resist with his Blast Burn on Kingdra (luckily, it was a crit), who missed with Hydro Pump, and got taken out by Leech Seed.
Needless to say, I was terrified of Lance ;)