Use an aerial attack in a way that causes you to land on a platform which would not have happened without the aerial attack. The reason is a downward shift of your character's environment collision box (ECB) bound to the attack or, more specifically, your character's bone alignment on a given frame.

The Ice Climbers is a character in which the player controls Popo (blue IC depending on costume color), while Nana follows and mimics Popo's inputs with a slight delay. The main strategy with Ice Climbers is abusing their grab combos, as they can kill off of most grabs. Strategies change constantly with IC's based on if your Nana is present or not.