Dead or Alive 5 Plus

For high difficulty levels, Alpha-152 is ideal (if it is already open).
The tactics are simple: constantly use the "7K" technique in battle. (up and back + kick).
The enemy will often fly into your counter attack.
4-5 such techniques against the enemy are enough to win.
Thus, the Legend difficulty can be completed without a single Continue and unlock a secret costume for Christy.

And if you don’t have alpha 152 open, you can spam Lei Fang again using the technique: down + back and +

I advise you to take Hitomi into tag mode and if you are playing paired with Lei Fang and she suddenly does not survive, then remember Hitomi back and +

And one good recommendation: if you suddenly run into an enemy’s blow, try to block the blow, or even better, lure him into the enemy’s attack (for example, you are attacked with an attack in the middle, press back in time + and spam again with the same technique).

+ on top of everything, you don’t have to worry about losing, because... A costume for Christy can easily be unlocked in ranked online battles.