By pressing A and B to dodge, then pressing Up twice, you're character will forfeit a round.
Although, the next round you start you'll have Max Power Gauge.
When you have un-equiped yourself or if your weapon has been knocked out of your hand, go next to hit, and press the A button. You're character will be temporarily left open to attact, while they are trying to pick it up.
To un-equip yourself of your weapon, first press A and B together to dodge, then press down, down.
Your character should do a little taunt, of sorts, then put their weapon into the ground.
Put the cursor over the Random box and press the folling codes on the Controller stick.