Here's a detailed guide for defeating Ironclad in "Final Fantasy 7 Rebirth," including requirements, walkthrough, strategies, and additional tips:
Requirements:

Ironclad Boss Guide in Final Fantasy 7 Rebirth
•Location: Fought in the Temple of the Ancients during Chapter 13.
•Rewards: Experience, AP, and progression in the story.
•Party Composition: Cloud, Tifa, and Barret are your party for this fight in Chapter 13, "Where Angels Fear to Tread."
Materia:
•Lightning Materia: Ironclad is weak to Lightning, so this is key.
•Healing Materia: Cure or Pray for healing, especially for Barret to use Chakra.
•Barrier Materia: To mitigate damage from Ironclad's physical attacks.
•Assess Materia: To understand Ironclad's weaknesses and resistances.
Gear:
•Equip Cloud with a weapon like the Twin Stinger for Counterstance, Tifa with Mythril Claws for stagger, and Barret with a weapon that boosts his ranged capabilities like the EKG Cannon.
•Consider gear with Lightning resistance or Elemental Materia linked to Lightning for extra damage.
•Level: Around level 50-55 would make the fight more manageable, but with the right strategy, you can attempt it at lower levels.
Detailed Walkthrough: 
Phase 1: Initial Attacks:

Ironclad Boss Guide in Final Fantasy 7 Rebirth
1.Sharpen, Thanatosian Blade, Graviga, Firaga, Grand Sword, Crush
Strategy:
2.Pressure: The only time to pressure Ironclad is during Sharpen; all characters should use Lightning attacks or abilities.
3.Avoid Damage: Dodge or block Thanatosian Blade and Grand Sword; these can deal massive damage.
4.Handle Magic: Dodge Firaga and use Manawall for Graviga to prevent instant death.
5.Crush: If a character is grabbed, switch to another to attack and free them.
Phase 2 (Staggering Ironclad - Tower Destruction):

Ironclad Boss Guide in Final Fantasy 7 Rebirth
Stagger:
1.Objective: Stagger Ironclad to make it fall and destroy the tower, which is part of the fight's objective.
Strategy:
2.Sharpen: Use this moment to stack Lightning attacks; Tifa's Overpower and Cloud's Focused Thrust are ideal for stagger.
3.Don't Overkill: Be careful not to kill Ironclad before staggering it, as you'll need to repeat the fight if you do.
Phase 3 (Post-Tower Destruction):

Ironclad Boss Guide in Final Fantasy 7 Rebirth
Final Push:
1.Ironclad's Vulnerability: After the tower falls, Ironclad remains staggered, making it the perfect time to unleash all your powerful attacks.
Strategy:
2.All Out: Use Limit Breaks, Synergy Abilities, and keep up Lightning spells to finish Ironclad off.
Strategies: 

Ironclad Boss Guide in Final Fantasy 7 Rebirth
•Exploit Lightning Weakness: Use Thunder spells, Barret's Bonus Round with Lightning Materia, and summon Ramuh if available.
•Stagger Management: Focus on using abilities that increase stagger when Ironclad is sharpening, like Cloud's Focused Thrust or Tifa's Overpower.
•Defensive Play: Use Barrier or Protect to reduce the damage from Ironclad's heavy attacks, save Manawall for Graviga.
•Synergy Abilities: Utilize Synergy Moves like Cloud and Tifa's Relentless Rush to maximize stagger and damage when Ironclad is pressured.
Tips: 

Ironclad Boss Guide in Final Fantasy 7 Rebirth
•ATB Management: Build ATB during Ironclad's non-pressure phases for use during Sharpen.
•MP Management: On Hard Mode, use MP Absorption with Lightning Materia or use abilities over spells when possible.
•Positioning: Stay spread out to avoid area attacks like Thanatosian Blade's shockwave.
•Limit Breaks: Save for when Ironclad is staggered, especially after the tower falls.
•Hard Mode: Equip Lightning Materia with Elemental on your weapon, and use Barret's Lifesaver to manage damage intake.
•Summoning: If you have Ramuh, save him for when Ironclad is staggered for maximum impact.
•Tifa's Role: She's critical here for stagger; use her to build up the stagger meter quickly during Sharpen.