Here's a comprehensive guide for defeating Rude and Elena in "Final Fantasy 7 Rebirth," covering requirements, a detailed walkthrough, strategies, and additional tips:
Requirements:

Rude and Elena Boss Guide in Final fantasy 7 Rebirth
•Locations: Chapter 3: Mythril Mines. Chapter 12: Gold Saucer Colosseum.
•Party Composition: Typically includes Cloud, Tifa, and Aerith.
•Cloud: Primary damage dealer with good balance between physical and magical attacks.
•Tifa: High damage output, especially good for staggering enemies.
•Aerith: Acts as the healer and support, with strong magic options.
Materia:
•Wind Materia for Rude (weak to Wind).
•Lightning Materia for Elena (weak to Lightning).
•Healing Materia for Aerith, with Prayer or Cure spells.
•Assess Materia for learning enemy weaknesses and resistances.
•Level: Around level 25-30 for an easier fight, but this can vary based on your party's gear and Materia setup.
Detailed Walkthrough: 

Rude and Elena Boss Guide in Final fantasy 7 Rebirth
Chapter 3 Fight (Mythril Mines):
1.Phase 1:
2.Start: Both bosses use basic attacks; Rude with Shockwave and Elena with Grenade attacks.
3.Strategy: Quickly pressure Elena with Lightning attacks, focusing on her first as she's easier to stagger. Use Cloud's Punisher Mode or Aerith's Lightning spells.
4.Phase 2 (Synergy Attack):
5.Rude's Atlas Stance/Elena's Petite Powerhouse: They prepare for a Synergy Attack.
6.Strategy: Interrupt this by using your strongest abilities or spells against the one charging up. Focus on Elena if you can, as she's less durable.
7.Phase 3 (Post-Synergy):
8.Rude Alone: After dealing with Elena, Rude becomes more aggressive.
9.Strategy: Use Wind attacks to pressure him. Keep an eye on his Triple Shockwave; dodge or block accordingly.
Chapter 12 Fight (Gold Saucer):
1.Similarities: Many mechanics from the Chapter 3 fight return, but with more polished moves.
2.Elena: Uses Nadefield and Turks Vengeance.
3.Rude: Has Turks' Two-Step and Whirlwind.
4.Strategy:
5.Prioritize: Again, focusing on Elena first can simplify the fight due to her lower HP and ease of staggering.
6.Counter Synergy: Use the same strategy of interrupting their Synergy moves. Here, they might use more devastating combo attacks, so timing is crucial.
Strategies: 

Rude and Elena Boss Guide in Final fantasy 7 Rebirth
Exploit Weaknesses:
•Rude: Use Wind (Aero or Tifa's Reverse Gale).
•Elena: Use Lightning (Thunder or Cloud's Firebolt Blade).
Stagger Management:
•Use Tifa's combo attacks to build stagger on Elena quickly.
•Chain ATB commands or use abilities like Focused Thrust on Cloud when enemies are guarding.
Synergy Abilities:
•Use these when both enemies are close or during their Synergy Attack preparation to maximize damage.
Defensive Play:
•Keep Aerith's healing spells ready, use Guard to mitigate damage, and dodge when necessary, especially during wide AoE attacks.
•Limit Breaks: Save these for when one or both enemies are staggered for maximum effect.
Tips: 

Rude and Elena Boss Guide in Final fantasy 7 Rebirth
•Switching: Switch between characters to control the battle flow, especially when one is at risk of being stunned or when you need to use specific attacks for weaknesses.
•Materia Management: If on Hard Mode, manage your MP carefully; consider changing Materia setups between fights if possible.
•Positioning: Keep moving to avoid Elena's grenades and Rude's Shockwave attacks. Use the arena's space to your advantage.
•Party Synergy: Utilize Aerith's Ward for doubled magic effects when available, especially with Thunder or Aero spells.
•ATB Management: Build ATB quickly with Punisher Mode for Cloud or Tifa's fast attacks, then spend it on abilities that can pressure or stagger.