This page explained in detail about Chapter 12: The details of the "Reno & Rude" bosses that appear in the Sector 7 Slums Piller, as well as a battle guide.
This is put together for the difficulty level hard. There may be changes in behavior and behavior with other difficulty levels.
The battle reference video is in the middle of this page.
●1st Level (Reno: HP Gauge from about 100% to 60%)
・Tifa's Chi Trap prevents Reno from attacking forever.
I recommend it because it prevents you from acting from the spot for an extended period of time while dealing damage with Chi Trap.
Repeat Chi Trap while building up your ATB gauge with normal attacks.
●2nd Level (Rude Hellicopter: HP Gauge from about 80%)
・A series of attack magic at the start.
Firaga or Thundaga are easy to hit. Hit as much magic as you have ATB before the bombing comes.
By accumulating a certain amount of damage, you can take down a 4th level Rude Helicopter in one shot.
When you run out of ATB, push it further with Barret's Overcharge, then Maximum Fury.
●3rd Level (Reno HP Gauge from about 60% to 40%)
・Pyramid at the start
One of your allies will be stopped for a certain amount of time & take damage.
Destroy the pyramid so you can act on it.
I recommend Tifa's True Strike, for example, which can do a lot of damage quickly.
・Fight with a Chi Trap.
When you're ready to fight, fight in Chi Trap as you go.
●4th Level (Rude Hellicopter)
・Barret's attacks & damage with magic.
If you do a lot of damage on the second level, you won't struggle as much.
Once this phase is over, the helicopter drops and the Roode appears.
●5th Level (Reno: HP Gauge from about 40% and Rude: HP Gauge from about50%)
They're both switching targets very quickly.
If you are targeted, it is recommended to switch to another companion to attack.
・If you want to defeat it down from a Rude
The wind attribute is the weak point of this game, so use an aero system to attack it at once!。
Aero types take a little longer to determine damage, so it's recommended that the control character attracts a rude and lets the other companions hit the aero types.