Victreebel
http://www.smogon.com/dp/pokemon/victreebel
In the Other Options section for Victeebel, it says, "Swords Dance is a poor option now, with only Razor Leaf for STAB and Return for 'type coverage'." Victreebel got access to Leaf Blade in Platinum, so Victreebel has a completely usable Sword Dance set, like this one:
Name: Sword Dance
Item: Life Orb / Leftovers
Nature: Naughty / Adamant
Moveset: ~ Sword Dance ~ Leaf Blade ~ Return ~ Weather Ball / Sleep Powder
EVs: 252 Atk / 124 SpA / 132 Spd
Swords Dance boosts Victreebel attack to 678. Leaf Blade is the reason I'm making this, allowing the set to be usable at all, physical and with a base power of 135, if you include STAB. Return provides coverage, along with power and accuracy. If you have Sunny Day up, then Weather Ball can hit Steels that would otherwise resist Victeebel, with 100 base power. Sleep Powder can be used if you want an easier set-up, or a good status move, but you won't be able to attack Steels.
The EVs given maximize attack, and (when under sunlight) out speeds all positive-nature Electrodes, and the rest is dumped into special attack to make Weather Ball stronger. If your using Sleep Powder, take the special attack EVs and put them into HP.
Life Orb gives an attack boost, which with his high attack and Sword Dance makes him even more capable of chomping some enemies, but drains your health whenever you do damage. Leftovers is if you don't want health nibbled at, but losing the attack boost could cause you to miss some KOs, which will leave you vulnerable to counter-attacks, which can be deadly to Victreebel due to his frailness. Use Naughty if your using Weather Ball, Adament if your using Sleep Powder.