Attack on R-Cyclone is the first level in Cyclone Stages. It appears every Monday.
Some B.B.Bunnies will begin to spawn at the start of the level and St. Pigge the 2nd will spawn shortly after you begin. Shy Boys will then begin to spawn (about 5 of them). After you attack the base, Red Cyclone will spawn, with 3 One Horns. The One Horns will constantly respawn throughout the battle after the red cyclone is spawned.
Using many anti-red and anti-floating cats can make this stage easier than you think.
Line-up 1 (ft. The red busters)
If you have momotaro, spam him in his unevolved form with a few meatshields. Since he has a 30% chance to freeze red, all the enemies will be frozen forever.
Line-up 2 (Classic strategy)
Wall Cat, Brah Cats, Sorceress Cat, Necromancer Cat, Sword Master Cat, Drama Cats, Dragon Cat, True Valkyrie Cat and Bahamut Cat (most, if not, all cats should be at least level 20 and rich cat really helps in the beginning of the battle, but it is not required to beat the level)
The One Horns fill up your wallet, making this the easiest Cyclone stage.
Another reason why this stage could be so easy is because of the humongous amount of anti-red + anti-floating cats.
Line-up 3 (ft. Thundia)
It is recommended to bring along Rich Cat and Sniper the Cat.
Please note that this strategy is only effective if you have all Superior Treasures from Empire of Cats Chapters 1 & 2. Chapter 3 Treasures also help.
Start by spamming Wall Cat. You will be doing this throughout the battle.
Once the B.B.Bunnys start coming out, spam Wall Cat and Ninja Frog Cat. To efficiently do this, while also gaining money, use a pattern like this: Wall/Ninja Frog/Wall/Repeat. This will allow you to build up money, albeit slower than just Wall Cats.
Once you've gained enough money, spawn Thundia.
When the Shy Boys spawn, spam everything you have (except Angry Delinquent, Whale, Thundia) to slow them down long enough to allow Thundia to defeat them.
Once the Cyclone comes out, spam everything. Do not turn off Sniper the Cat at any point. If you send out enough Pirate Cats and other knockback or freezing units, the Cyclone should barely be able to move for a good time.
Once the Cyclone is down, destroy the base and you win!
The One Horns will, as stated above, provide extra money, allowing you to continue spamming.
Line-up 4 (ft. Pirate swarming)
You can add Sniper too.
There's no real strategy for this, as the pirate stack will do the job. Stack enough of them and red cyclone will be completely stunlocked and will be able to barely move. Though, I don't think this will always work, as it's up to RNG. True form should almost guarantee that this works.
Line-up 5 (ft. one of the worst Ubers ever: Wargod Masamune)
Mohawk Cat, Samba Cat, Catburger, Face Cat, Gentleman Cat, Delinquent Cat, Wargod Masamune, Crazed Bahamut Cat, Glorious Amaterasu, The White Rabbit. Basically, the strategy is to lure the Shy Boys to your base, summon your Ubers, and catspam. Your goal is to get the Red Cyclone at the enemy base by using your 3 freezers and your knockbacker. The reason I didn't use Brah Cats is that they have too little range, and not as much attack. I recommend that if the cats listed have a true form that has either the same or higher range, use it. This is mostly RNG, so it won't always work. Max all these cats before attempting this stage. A simple summary would be this: Knock back the Cyclone and freeze it so it cannot attack. Then finish it with Ubers and Crazed Bahamut. Good luck!
Line-up 6 (ft. Elemental Duelist Cat)
Lineup: Mohawk Cat, Eraser Cat, Flying Ninja Cat, Captain Cat, Elemental Duelist Cat, Island Cat, King Dragon Cat, Jamiera Cat, Crazed Bahamut Cat, Archdragon Dioramos. Start stalling by spamming Erasers and E. Duelists. Spam the worker cat while doing so. Once the Shy Boys come out, spam the front row and the first three of the back row. The Shy Boys should soon perish and your money will fill up. At that point, spam everything you have. Even after the Red Cyclone comes out, just keep spamming. You need 300% Relativity Clock to use a second Bahamut. In my experience, R-Cyclone cut through my Bahamut and Dioramos and cut throughout the rest of my spam until it almost reached the base, and then a hit from Bahamut dealt him the finishing blow. Good luck.