Taking on the Corrupt King

After all the Digimon of each timeline had finished their stages of Digivolution, they were ready to fight and save those who had been brainwashed by Specter's evil.
Splitting up into groups Tai, Matt, Davis, Ken and the Tamers were taking Gallantmon on.
"Terra Force!" WarGreymon yelled out, gathering the energy within the atmosphere around him in the form of a orange energy sphere, before firing it at Gallantmon, 
As the blast struck Gallantmon, creating a massive explosion, Tai called out. "Nice shot, WarGreymon!"
However, when the dust from WarGreymon's blast died down, everyone was stunned to see Gallantmon was still standing, holding his shield up before him, showing he had sustained no damage whatsoever.
"No way!" Davis shouted, stunned that WarGreymon's attack had failed.
"Lightning Joust!" Gallantmon then exclaimed, firing a blast of energy from his Gram Lance that struck WarGreymon, blasting him to the ground.
"WarGreymon!" Tai yelled out in concern, rushing over to his Digimon partner.
"Behind you!" WarGreymon yelled out. Tai turned around to see Gallantmon charging at him, his Gram Lance ready to pierce through him and his Digimon partner, only for Imperialdramon to exclaim. "Splendor Blade!"
Imperialdramon then appeared before Gallantmon, his blade of light clashed against Gallantmon's Gram Lance as the pair struggled against each other.
"Listen, pal. You may be controlled but that won't stop me from defeating you!" Imperialdramon told Gallantmon, determined to protect his friends.
As was Beelzemon, who appeared behind Gallantmon, grabbed his arms and restrained him.
"C'mon, you two. Snap out of it!" Beelzemon called out, hoping to reach Takato and Guilmon as Gallantmon continued struggling against Beelzemon.
But his words failed to reach Takato or Guilmon as Gallantmon then broke free from Beelzemon's grasp and slammed his shield into Beelzemon's face, knocking him several feet away from him.
Gallantmon then charged at Beelzemon, ready to strike him down and delete him.
"Taizoukai Mandara!" Kuzuhamon exclaimed as she appeared before Beelzemon and created a barrier around herself and Beelzemon, which blocked Gallantmon's attack.
Normally, Gallantmon would be able to pass through, but due to the evil now influencing him, the pair were protected from his attacks.
"Beelzemon!" Beelzemon then heard a familiar female voice call out to him. He turned and was shocked to see Ai and Mako had entered the battle.
"Ai, Mako? I thought I told you two to stay home." Beelzemon told them.
"We're sorry." Mako apologized, before saying. "But we were worried about you."
Seeing Ai and Mako, Gallantmon turned his attention, as well as his weapon to the kids, preparing to attack them.
"Lightning Joust!" Gallantmon exclaimed, firing another blast from his Gram Lance at the defenseless children, who held each other and closed their eyes tightly.
But the attack never hit them.
Instead, the pair heard screaming and after opening their eyes they were horrified to see Beelzemon standing before them, taking the attack as he was being electrocuted.
"Beelzemon!" Ai and Mako cried out in horror and concern as Beelzemon collapsed to the ground.
After witnessing Beelzemon's selflessness to protect his human partners and friends WarGreymon, Imperialdramon, MetalGarurumon, MegaGargomon, Sakuyamon, Kuzuhamon and Justimon all stood before the fallen Beelzemon to protect him.
"Terra Force!"
"Ice Wolf Claw!"
"Positron Laser!"
"Gargo Missiles!"
"Fox Drive!"
"Ura Izuna!"
"Justice Burst!"
The seven Digimon all exclaimed, firing their attacks at Gallantmon in a massive explosion of pure power.
"Alright!" Davis cheered, sure this time that they had defeated Gallantmon, only for Matt to reply in a serious tone. "I'm not so sure."
And the Digidestined of Friendship was right as the dust faded, revealing that Gallantmon was once again hiding behind his shield, his body had been wounded but he was still standing.
"Shield of the Just!" Gallantmon then exclaimed as he unleashed a devastating beam from his Aegis Shield that struck all seven Digimon, blasting them away from the power and sheer force of the attack.
"No..." Beelzemon groaned out as he had seen his friends risk themselves to protect him, now it was time for him to do the same.
"I won't...I won't give up! I won't give up on myself or my friends!" Beelzemon roared out as Ai and Mako's D-Power then activated. Beelzemon glowed gold and changed to his Blast Mode.
"And I won't give up on you! Corona Blaster!" Beelzemon then roared out, firing a blast of purple energy from his arm cannon.
"Shield of the Just!" Gallantmon exclaimed, once again firing another blast from his Aegis Shield, which clashed with Beelzemon's attack.
But thanks to the power Beelzemon had gained from the strength of his friends and his determination to save Takato and Guilmon, his attack cut through Gallantmon's blast and struck him down.
"Now!" Kuzuhamon called out to her sister, who got up and nodded.
"Amethyst Mandala!"
"Taizoukai Mandara!"
With that, Sakuyamon and Kuzuhamon created a massive barrier around Gallantmon, causing him to cry out as all the evil within Gallantmon's body was being purified, leaving him defenseless.
"One more time!" Davis called out.
"Terra Force!"
"Ice Wolf Claw!" 
"Positron Laser!"
"Gargo Missiles!"
"Fox Drive!"
"Ura Izuna!"
"Justice Burst!"
"Double Impact!"
The combined attacks shot through Sakuyamon and Kuzuhamon's purity barrier and struck Gallantmon head on, creating a massive explosion, one that he was unable to escape from or defend against.
The power was too much for him and Gallantmon split back into Takato and Guilmon, leaving them down but the others were still fighting those still under Specter's influence.