Saw this thread, here's my ideas:
Bronze:
Ragequit Factor: Achive a Rating of 1150 or more without knocking out all 6 of your opponents pokemon. (Opponent Forfiets)
Boom Boom!: Win a battle only using the following moves to deal damage: Explosion, Self-Destruct
Silver:
Banging Your Head on a Brick Wall: Win a battle though Confusion Damage.
Counter Productive: Win a battle with the following conditions: All of your Pokemon Must hold the Toxic Orb. You a May not use Pokemon with the following Ability's: Magic Guard, Poison Heal
Gold:
Power Counter: Win a battle only using the following moves to deal damage: Counter, Mirror Coat, Metal Burst.
There's a Limit!: Win a battle with the following contidtions: All of your pokemon must have 0 Ivs in Every Stat, No EVs, And a Quirky Nature. Ditto is Banned.
Platinum:
Pokemon Gambling: Win a battle only using the following moves: Metronome