Usually you want to have the opponent in a bad situation where they're in the air and you can attack them if they do nothing, but if they attack you you can still retaliate because of the armor.
Example: https://www.youtube.com/watch?v=vM1ZSl7BtGU&t=5m57s
In other cases you can do it on reaction: https://www.youtube.com/watch?v=vM1ZSl7BtGU&t=6m38s
It's harder to do this to Marth since he can outspace your aerials with his disjointed hitboxes, but I have seen aMSa do what you're looking for in neutral against a Marth player and unfortunately don't remember the video. I remember it was on his channel, though.
Example: https://www.youtube.com/watch?v=vM1ZSl7BtGU&t=5m57s
In other cases you can do it on reaction: https://www.youtube.com/watch?v=vM1ZSl7BtGU&t=6m38s
It's harder to do this to Marth since he can outspace your aerials with his disjointed hitboxes, but I have seen aMSa do what you're looking for in neutral against a Marth player and unfortunately don't remember the video. I remember it was on his channel, though.
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