I'm not sure if this is new but I managed to get this after screwing around while being bored. It started from Sess's Nettori battle (of shooting a Missile right after the Charge Beam) and I decided to try the same trick against other bosses: X-BOX, Ridley, and mostly importantly SA-X.
http://www.metroid2002.com/ekarderif/sa-x.vm0
http://www.metroid2002.com/ekarderif/sa-x.vmv
http://www.metroid2002.com/ekarderif/sa-x.avi
This saves the hassle of waiting for SA-X to stop her Screw Attack since you keep her frozen for all eternity so you can shoot her as soon as you charge up. You also stand directly in front of her so the flare always deal damage.
Edit: I used VBA 1.7.2.
http://www.metroid2002.com/ekarderif/sa-x.vm0
http://www.metroid2002.com/ekarderif/sa-x.vmv
http://www.metroid2002.com/ekarderif/sa-x.avi
This saves the hassle of waiting for SA-X to stop her Screw Attack since you keep her frozen for all eternity so you can shoot her as soon as you charge up. You also stand directly in front of her so the flare always deal damage.
Edit: I used VBA 1.7.2.
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