In Adventure/Classic 1 Player modes, you will face giant and metal foes. The easiest way to defeat them is, without a doubt, to rack up heaps of damage. Here's an easy way to do so. Choose Mewtwo as your character. In the Metal Character/Metal Bros. stage, the characters will start on the top platform. As soon as the announcer says "GO", press B to charge up Shadow Ball. The character(s) will drop through the platform, straight on top of the charging Shadow Ball. Their weight prevents them from bouncing off the ball like a regular character would, and in no time, they will rack up heaps of damage, making them vulnerable to a KO! Also, the attack has a high priority, and the shocks occur in very quick succession, so they can't air doge their way out of it. The same pricipal applies to giant enemies. Just wait for the opportune moment...