Gungrave G.O.R.E

To make this happen quickly there is a skill you buy called Storm Barrage: dodge, for around 6000 points.

With this skill once you get to 50 beats just spam dodge and y. Every single time you press dodge and y it counts as 1 use. Use it in battles and you can do it a lot before your beats go away. If you do it every time you get 50 beats you’ll get it quickly.

Easier to do on easy bc you can lose your shield and health pretty quickly on higher difficulties.

I found a super quick way to get this where you’ll have it in about 30 minutes just spamming the Y button. Get to 50 and reach an area with shield enemies. Kill everyone else only leaving 1 or 2 shield troops. Now spam y. They won’t die and you can do this infinitely. While active as long as you have a shield they can’t stutter you. When your shield runs out just stop doing it while firing normally at them until your shield comes back and rinse and repeat. You’ll have this in no time at all.