Spoilers from included and/or represented works abound. Please read this fiction carefully.
Travis called the entire team minus Dante and Tracking Error. "Now, we're ready. And you, Another Ohma... You and you friends will pay... FOR WHAT YOU'VE DONE TO THE TROPE PANTHEONS!!!"
"Do you know what have all of you done? Especially you, Akuyaku Reijou!?" M yelled at the team.
"We're doing what we had to. You're collectively all a threat to both real-life and fiction." Travis called them out.
"Why do you oppose us so badly?" N questioned the team. "Project Mobius is the best course of action. Us Order has been prepared for... oh so long it's only arbitrarily known. Very long, ever since the start of all Realitiers!"
"And you all plan to bring that down before it reaches its apex? You want us all truly empty-handed and at risk of cessation?" M cried. "You... you all are dangerous! You should just be erased from existence! Altogether!"
"So I draw my blade to end you all." N reached out to his sword. "You shall meet your end, and the leak shall be prevented."
"Nice Blade you've got, a programmed clone!" Matthew mocked N using the sword as the subject.
"Backhanded compliment you got." M laughed back.
"Mr. Decade... here." Doraemon gave Decade a copy of Bestfriend Telecard (親友テレカ). "When the come, let's see what you does with it."
Dora-nichov falls off his scarf, and went full werewolf, due to spotting the Power Frame. This marked the start of the battle, as the combatants charged into battle.
"We'll kill you all!" The horrible trio charged in.
And there be trade blows. The combatants did in with their own combat abilities and all that they could cast to fight the three elite Realitiers. Dante (free of the duty this time, as usual) and Tracking Error (having never actually fought ever) watched as even Luke Sullivan (currently powered by 5-U-93-R), the friends (only fought because of Doraemon's gadgets) and Access (not much of a fighter, especially prior to meeting Telos) brawl against the three.
"We won't let you remove us!" The rest of the Sinners struck.
Access, in particular, became a new thorn to the clone duo, as the child of two worlds himself rapidly used teleportation to allow him to strike and dodge away. It helps that he, Telos and Valda not only have ways to deal with Realitiers through fighting, but they makes extensive uses of their powers, this time without relying on the summons.
"Fuck you! Why won't you die?!" Hiryu struggled against the Holo-girls and the Chaos God, who did their best with all their powers to make sure he is taken down.
"We're doing what we had to!" Malal blasts Hiryu for the damage.
The combatants together borrowed and exchanged Doras and their gadgets on the fly, making it even harder for the dreaded three to keep up.
"Final AttackRide: D-D-D-Decade!" Decade performs the Empowered Dimension Kick 21 to the Another Rider. However, N doesn't react.
"Too little." M mocked Decade's act.
Hiryu is knocked down, but not very violently zapped. Decade is surprised, but Charlotte actually knew...
"Uh, Knight Decade..." Charlotte called.
"Knight? Why are you calling me a knight?" Decade is confused.
"You have the power of all Heisei Riders and initially Reiwa stuffs like Zero-One. But it's not enough." Charlotte pointed it out. "We need to use Ohma Zi-O, who have all the powers of all Kamen Riders in existence altogether. And this is Another Ohma Zi-O we're dealing with!"
Hiryu glitched back and got up, recovered from the Dimension-impact. The duo then laughed at Decade.
"Even at the strongest ever, the Complete 21 is but just a fraction of Ohma Zi-O!" M gloated. "Not to mention, our Ohma Zi-O has taken the powers of the Pantheon! He's the strongest Demon King there is!"
But the mockery gave Travis the time to whoop the duo, letting him and the Sinners beat them up.
"How dare you interrupt our destiny?! And how did you defy... No! I won't leave Noah and Mio to die!!!" Hiryu glitched in and got up. "That's it! I will have Another Heisei! 'cause I'M NOT WORTH ANY ERA!!! ORDER OF PARIAH WAS MY SAVIOR! I MUST RETURN THE FAVOR!!!"
Another Ohma summoned all 20 Another Heisei Riders, and then turned two, Another Kuuga and Another Zi-O into Another Ultimate Kuuga and Another Zi-O II respectively.
"Goddamn it! Another Final Forms!" Travis is ridiculed at the two Another... final form Riders.
"Hah!" The duo got out of the Sinners, and poised. "You're done!" *slashes the Sinners down*
"You are too far! I can't stand it!" Malal enlarges himself to match Another Ultimate Kuuga. Sana was about to remove her limiter to deal with the monstrosity, but Kronii stopped that.
"It's too risky, Sana!" Kronii objected. "This situation is more dynamic than when we fought Parallax! We cannot take advantage of limit break, it's too risky!"
Another Ultimate Kuuga then overpowered the Chaos God, causing the latter to be literally weathered down.
"It's spamming weather! Ahhhhhhhhhh!!!!! And how did it beat down me with that!!!"
"Don't you see?" Hiryu revealed. "By breaking the system behind the Pantheon, I can not only hijack its entirety and allow me to destroy the Main House and end the Pantheon... I can now counter continuity-related trash such as that raging beast. And even my summons can do that too!" *evil laughs*
"Malal, no!" The Final Knight rushed towards Another Ultimate Kuuga. "Another Kuuga, I will not let you!"
But Another Zi-O II, being essentially the GrandZi-O in corrupted Zi-O II form, froze the old man in time, and is about to kill him.
"Not so fast!" Access teleported to grapple Another Zi-O. "Summon!"
"Die!" N charged towards Access to save Another Zi-O II.
But the child of two worlds teleported instead, causing the Logos stand-in to crash into the Another Rider.
"Summon some titans. They're large enough." Suggested the villainess.
"Good observation- wait... What titans?" Travis is confused, clearing in the present which is behind the near future Reijou/Charlotte originally came from.
Charlotte briefly mimicks some singing toilets with human heads, to nod the confusion.
Timeline note: Travis is from before episode 11 of Skibidi Toilet at the time of the event happening right here, while Reijou is originally from after episode 64 as of her death.
"Ok. Titan Cameraman, Titan Speakerman and Cinemaman there is." Telos gave thumb-up again, the same way as actual Kuuga.
Cue the summoning of Titan Cameraman, Titan Speakerman and the Cinemaman to fight Another Ultimate Kuuga. (All three are similar in sizes compared to the monstrosity, and is equipped with upgrades present later on...)
"You took those titans straight from the future!?" Hiryu is baffled. "What the hell!?"
Another Ultimate Kuuga flew up, but is caught down by the titans with usage of jetpacks, bringing the monstrosity down closer to the ground to fight. Cue the laughter from Tracking Error and Travis himself.
"Those camera setup must be heavy!" Travis made fun of the... weight.
Titan Cameraman (literally) fires Another Ultimate Kuuga, who in turn set the three titans aflame, N-Daguva-Zeba style. The Cinemaman the glare from its screen to blind the monstrosity, before Titan Speakerman blast it off repeatedly. Then the titans dissipates.
"All Rider Kick!" All Rider heroes till Reiwa in their final forms did a joint Rider Kick to finish Another Ultimate Kuuga.
"You...!!! Heisei Riders, attack!" Hiryu enraged.
The remaining Anothers directed their shits on the Sinners and the Blood Team.
"What are these..." Skelter!Sleeping Beauty finally noticed the Another Riders.
"Another Kamen Rider. In Western terms, it's Monstrous Rider!" Travis warned them.
Another Ex-Aid tried to alter the scene into mimicking the Jail tower, but the Red Riding Hood attack the monstrosity and interrupts the act.
"They are fighting hard! I can knock them off, but..." Skelter!Red groaned. "Watch out! It's so-called... Another CycloneJoker!"
Another Double tries to Rider Kick a hapless Hong Lu to death.
"Do the Kabuto!" Telos threw the Kabuto Zecter to Charlotte.
"Uh oh." Hong Lu realized that he's about to die.
"Henshin! Change Beetle!" And then, Another Double is knocked off, crashing to Another Faiz.
Another Kabuto noticed that, and did Clock Up to ambush the villainess. The two clashed beyond the speed of sound, which accidentally distracted the duo.
"Crap! We've a hard time tracking the villainess!" M is frustrated.
Travis used this time to kick M at pelvis, bringing the pain onto false Pneuma. N reacted by a quick slash, but the No More Hero reflexively grappled him and suplexed, cracking the false Logos' neck (which would've likely killed a normal human).
Another Kabuto is knocked out of Clock Up, vulnerable through slowness so the princess can finish the monster off.
"1, 2, 3: Rider Kick!" And she did. A simple Rider Kick powered by tachyon, and Another Kabuto is destroyed. "Clock Over!"
"It's easier to destroy Another Rider with appropriate powers." Charlotte untransforms. "Sinners, the Blood Team, get it?"
"Wait... Kabuto? Destroying... Kabuto with Kabuto?!" Skelter!Cinderella is confused.
Another Faiz tries to Rider Kick on Skelter! Cinderella, intending to at least break her leg. But Telos heard the suggestion.
And suddenly, Skelter!Cinderella is equipped with SB-555L Faiz Pointer on her right leg.
"Exceed Charge!" She kicked the air, and the device shot a crimson energy drill to Another Faiz, stopping it in its track.
"Ohohohoho!" Skelter!Cinderella laughed. "I like this power! Here, let's me kick this pathetic monster!"
Another Fourze noticed the scene and panicked, while Another Faiz struggled to get out of stasis. Skelter! Cinderella then sprinted and then leaped, and did a variant of Faiz's Crimson Smash.
"Cinderella Smash!!!" A flying side kick, pushing the drill and destroy Another Faiz, simple as that.
Cue Another Fourze enraged, and immediately tried to attack Cinderella, who just emerged from the finisher.
"I'm sorry." Otsuu (つう), armed with Fourze Cosmicstates' Barizun Sword, bashed the Another Fourze down in Boost mode.
-*turns to Nightmare form and switches to Slash mode* "Nightmare Super Galaxy Finish!"/"ナイトメア超銀河フィニッシュ!" Otsuu stabs Another Fourze with that sword, destroying the monster.
But the explosion knocked Otsuu far off, crashing her to her wife, the Little Mermaid of Mary Skelter. The two tumbles down, right in front of Hiryu.
"Two bloody lesbians, desperately fighting for all sake." Hiryu grabs both. "You go on, I'll kill both!"
The remaining Another Riders cheered, while the rest of the Blood Team stopped in horror.
"Otsuu! Little Mermaid!" Jack and Doraemon is shocked.
"Get us out!" Otsuu struggled in rage. "Me and my beloved wife don't deserve this!"
"No, you monster, you do!" Skelter!Mermaid objected. "Hiryu Kakogawa! You must die! We're not your hostages!"
Another Ohma Zi-O simply laughs.
"Why even use Riders' power to destroy Riders?" N got up. "Oh, and you, Touchdown, you are too dangerous to be left alive! You're the worst assassination we've ever dealt with to date!"
"Good point, Noah Vandham." Hiryu wanted to thumb-up on N, but is currently grabbing two Blood Maidens with both hands.
"Noah... Vandham? Did you just insert my family name?" Matthew is dumbfounded.
"Don't insert 'Vandham'. Just Noah of you want to be formal." Hiryu replied. "Ok, so now I blow those two's heads off-"
"Gin-gin gira-gira galaxy! Saikō! Saizen! Saidai! Saikyō ō!"
"Kamen Rider Geats... Command... X!"
"Take off complete! Time King and Space Lord! Ready, fight!"
"How... h-h-how...?!" Hiryu is terrified. "Ginga and Ohma Zi-O?! HOW IS THIS POSSIBLE!?"
"Fuck you!" M still reeling from the impact earlier.
"Command no toki! Lock on."
Telos creates the Final KamenRide: Ohma Zi-O and KamenRide: Ginga cards from two blank Rider Cards, and then summoned Decade Violent Emotion.
"What's this?" Decade receives the Ohma Zi-O card.
Violent Emotion (激情態) takes the Ginga card and activated it.
"KamenRide: Ginga!"
"You!" Hiryu drops Otsuu and Skelter!Mermaid off.
"Huh. This card is kinda over the top... but oh well." Decade inserts the card.
"Final KamenRide: Ohma Zi-O!"
"Gin-gin gira-gira galaxy! Uchū no kanata no fantasy! Kamen Rider Ginga!"
"Shukufuku no toki! Saikō! Saizen! Saidai! Saikyō ō! Ohma Zi-O!"/"祝福の刻！最高！最善！最大！最強王！オーマジオウ!"
Meanwhile...
"Finally! That annoying Pantheon is destroyed at last!" The queen celebrated. "Now there'll be much less possible resistance to our glorious plan!"
"We also imprisoned a survivor into the deep cell. He's far too dangerous. He hacked into the Mobius Chair!" The same Realitier who spotted Pantheon!Laughs reported. "We're currently cleaning up the ruins and set it up for future uses. Its domains and powers will be all ours."
"We're only here with you because you have our alliance be part of yours." The AkaRider (Ryuya Asami) told the queen. "But remember when we destroyed your world... you were the only known survivor. We destroyed that world to prove we were superior, so in hindsight, glad you sided with us. So do not-"
"If you fail, you'll die as double as punishment and revenge. You destroyed my world, so you better make up-"
"Ok, we'll help you out! But no betrayal!"
"Rule 3: Death to all traitors."
"Uh... there's a problem." The Realitier have something. "Turns out that Bruce Wayne hacked... because of the villainess and co. They collectively call themselves... One Reincarnated Army Corps. And more recently... there's a man known as Decade."
"Decade?" AkaRider heard it. "That motherfucker... That man now working with the villainess?! And he leaked so much infos, too! So thanks goodness we got rid of Trope Pantheon!"
The queen is devastated realizing all this.