Press Up + Attack (similar to Zero's X4 move).
Charged Buster (sparks are left after hitting an enemy)
Lightning chip

Press Dash + Attack (a lightning sword pierces through an enemy)
Charged Buster (a ball of electricity)
Ice chip

Press Down + Attack in mid-air (another of Zero's X4 move).
Charged Buster (turns into three rays; X3's Sting Chameleon)\
Normal chip