Super Jumping

From Shoryuken Wiki

Super Jumping is like a regular jump except much higher and it has different properties and rules once you do it. For instance you can air dash after 5 or 6 frames but you can attack with a normal/special/super (for the most part, again, this is MvC2).

Doom's CR.HK can be SJC'd before it finishes. If there is something that causes you to block present you can do CR.HK > SJ(up back) repeat to get meter very quickly.

Also Sonson's S.HK is the same.