This is a guide to beating the Boss The Valkyrie in the game Final Fantasy VII Rebirth (FF7R). This article explains The Valkyrie’s attack patterns, weaknesses, and tips and strategies for defeating it on both Normal and Hard Mode.
How to Beat The Valkyrie in Final Fantasy VII Rebirth (FF7R)

Use Lightning Materia
Like other mechs, The Valkyrie suffers from a serious weakness to Lightning Magic. It’s suggested to equip all three party members with Lightning Materia before the battle, and be sure at least one is powered up to Level 3 by this point, unlocking Thundaga.
It’s highly recommended to give Elemental Materia + Lightning Materia to Barret, so his bullets will deal extra damage to The Valkyrie throughout the fight. Since he’s the only ranged fighter available, this will provide a steady source of damage even when The Valkyrie is out of reach.
Prepare Immunity to Sleep
The Valkyrie’s Antipersonnel Gas Ability can put your best fighters to Sleep in the middle of the fight. Its Poison effect can be remedied quickly, but it’s best to ensure that you can avoid sleep using Accessories such as the Headband, or combinations like Warding Materia + Binding Materia which provide immunity to Sleep.

Hide Behind the Wall
In the second phase of the fight, there will be a wall available which The Valkyrie’s bullets can’t penetrate. Use this when The Valkyrie is preparing an Ability, then come back around to fire off a stream of bullets with Barret.
Pierce Limiter Override with the Laser
When The Valkyrie uses Limiter Override, it becomes resistant to all types of attacks, which also causes your attacks to have almost no effect on its stagger gauge.