SOULCALIBUR VI

I'm using SoulCalibur notations in this solution:
- A = Horizontal attack --> by default
- B = Vertical attack --> by default
- K = Kick --> by default
- G = Guard --> by default

To hit a Critical Edge, you must press A+B+K (you can set a shortcut to a single button for that) while you have at least 1 bar of power gauge.

Just make sure your character is close enough to your opponent so that he can hit him. Repeat 20 times (outside of Training mode). Of course, you can play on your own with 2 controllers in Versus mode to ensure your opponent won't dodge the attack.

Select 'Battle' then 'Versus' with the following settings:

Player: Player vs CPU
Round Count: 5
Battle Time: Infinite
CPU Difficulty: Easy
Battle Mode: Standard
Pause Menu: Standard

Select any characters for yourself and your opponent. In the match perform Reversal Edges (Press Y+A) to quickly build up your Soul Charge. When you reach 1 in your gauge then you can perform a Critical Edge (Press X+Y+B).

It's unlikely that you'll do 20 Critical Edges so repeat the process in a second match to get the full amount.

This can also be done against a second controller but on Easy this is still very simple to complete.