Remember when I said I was doing my own challenge? I apparently lied, because I'm not.
The remaining cats are: Sorreltail, Cloudtail, Jayfeather, Graystripe, Russetfur, Flametail, Blackstar, and Starlingpaw.
The Challenge by Redstar: 'you could make them do smash bros transport them into the game and have them fight each other.'
Quoted because I can.
I do not own Warriors, nor do I own Super Smash Bros. Brawl. That game belongs to Nintendo, and may I add that it is amazing and SO much better than Super Smash Bros. (Controller wise anyway) I do not own any references. I do not own Super Smash Bros.
EDIT: NOOOOOOOOOOOO! I lost sooo much right there because I got booted from fanfiction for typing for like 10 minutes. Thanks a bunch.

"GOOD MORNING!" Skinny shouted.

"Good morning!" Russetfur purred.

"You're awake?" Skinny asked her.

"I bring breakfast." Russetfur held up a large plate with dozens of mice, toads, and rabbits.

"Okay..." Skinny decided not to ask anymore questions. She got out a megaphone. "GOOD MORNING EVERYONE! IT'S TIME FOR YOUR NEXT CHALLENGE!"

"Do you have to yell so loudly?" Graystripe asked, coming out of the ThunderClan camp as every cat left their camp. "My stomach is hungry."

"Uhhh..." Skinny just stared at Graystripe. "What does that have to do with-"

"Here. Food." Russetfur tossed the large plate in the middle of the group of cats. "Eat."

"FOOOOOOD!" Graystripe grinned and began eating a particularly large rabbit.

"Fanf foo Fuufehfuh!" Sorreltail thanked Russetfur.

"No problem," Russetfur muttered as she picked out a small toad and nibbled at it.

Nibble. That's an awesome word. It just lacks the letter Q. Like Quibble. That's even better.

Back at the plot...

"Before we start our next challenge," Skinny announced. "I'd like to let you all know I quit."

"You...quit?" Starlingpaw asked. "Why?"

"Because I burned my contract in flames!" Skinny exclaimed. "Therefore, your new host, straight from SunClan itself, is Pricklekit."

"Well, there's that," Blackstar agreed. "And there's the fact that you can do whatever you want and get away with it because no one cared anyway."

Dirtplace camera...

Pricklekit "Well, first I'm forgotten. Then my littermates go from kits to warriors. Then I'm completely forgotten and am assumed dead. My life is just wonderful."

"It would be, if you were alive," a random voice said.

"Who are you? How did I die?" Pricklekit inquired.

"Who knows who I am? I'm an unnamed voice. I could be your conscience, the cat right next to you, or Riverstar herself. Anyway, you died from a bad case of greencough along with another forgotten member of RiverClan."

"Really?"

"No."

Pricklekit walked back over to the contestants. "Alright then. So now what?"

"Now what?" Jayfeather repeated. "Give us our challenge!"

"Challenge?" Pricklekit gave the other cats a blank stare.

"FOR THE LOVE OF STARCLAN!" Jayfeather yowled.

"According to this cue card, we're doing a Smash Bros. themed challenge," Cloudtail announced as he held up a cue card that was for Skinny before she quit.

"Give me." Pricklekit snatched the cue card out of Cloudtail's hands. "Great. We're going into Super Smash Bros. Brawl. It'll be a Team Battle, Blackstar and Starlingpaw against Sorreltail and Cloudtail. The rest of you, Flametail, Jayfeather, Russetfur, and Graystripe, will be the replacement of our Assist Trophies. Any question, see pi."

"Pi!" Sorreltail shouted.

"What?" Pricklekit hissed.

"Nothing." Sorreltail stared nervously at Pricklekit. He was in a bad mood.

Super Smash Bros. Brawl...

Welcome to Super Smash Bros. Brawl! Brawl, Normal, Team Battle.

Please select a stage. Though it really doesn't matter. You're a big fat hacker. Unless your little and skinny. Then you're a little skinny hacker. Either way, you've hacked into the game. Nintendo has been notified. You will have no chance to survive make your time.
Ha ha ha.

Stage Selected. Loading.

Saffron City Stage...

"This stage isn't in Super Smash Bros. Brawl," Cloudtail pointed out.

"It's from the original Super Smash Bros.," Pricklekit told him. "3, 2, 1, GO!" And with that, Pricklekit disappeared.

"Now what do I do?" Starlingpaw asked Blackstar.

The Game has been Hacked. Nintendo has been Notified. Super Smash Bros. laws have replaced Super Smash Bros. Brawl laws. Super Smash Bros. Brawl laws no longer apply, said a random voice.

"Looks like we're playing Super Smash Bros. on the Wii with Assist Trophies," Blackstar thought out loud. "Just kill them, I guess. Become a Nintendo character, blah blah blah."

Starlingpaw blinked. Blackstar now had on a red suit with an arm cannon. "What just..."

"Hurry up, hurry up, DODGE!" Samus Blackstar hissed.

Starlingpaw turned around to see a tongue coming for him. He tried to run but it was too late. The tongue grabbed him, and next thing he knew Starlingpaw was inside of an egg.

Yoshi Sorreltail smiled with satisfaction. "Now for the other one." She grabbed a small egg and prepared to throw it.

SHOOP DA WHOOP! Yoshi Sorreltail was blasted off of the map by Samus Blackstar's blue laser.

"Looks like it's you and me," Link Cloudtail said to Samus Blackstar as he drew his sword.

Meanwhile...

Fox Starlingpaw burst out of the egg he was trapped in and grabbed his gun, ready to join the battle.

Link Cloudtail and Samus Blackstar were on the Helipad on the building next to Silph Co. Fox Starlingpaw prepared to join them.

That's when the Electrode used Selfdestruct.

Starlingpaw collapsed from the impact. Struggling to get up, he noticed a nearby item. "Assist...Trophy..." He grabbed and threw it to reveal Flametail.

"Well, it looks like you just died and came back to life," Flametail commented.

"Yeah...nevermind that," Starlingpaw hissed in pain. "Let's go get that Cloudtail."

"Fine by me."

Fox Starlingpaw and Sonic Flametail jumped off of Silph Co. and onto the Helipad building.

Helipad Building...

Fox Starlingpaw wasn't able to make the jump to the building and fell down in the small space between the two buildings.

"That failed," Sonic Flametail commented.

"FLAMETAIL!" Samus Blackstar yowled. "GET YOUR HEAD OUT OF THE CLOUDS!"

"Yes, sir." Sonic Flametail went into a spin dash and hit Link Cloudtail.

Unfortunately, he also hit Samus Blackstar.

"YOU IDIOT!" Samus Blackstar screamed as he fell. "NOW WE'RE GOING TO DRAW!"

"Who said anything about drawing?" Link Cloudtail asked. He used his Hookshot to pull himself onto the nearest building by hooking it to a box. "I believe we win."

"MOUSE DUNG!" Blackstar spat as he continued to fall. "MOUSE DUNG YOU ALL TO DEATH!"

Boom.

Blackstar died.

Green team wins! Good job, you hacker. Now Nintendo has set you up the bomb. Soon you shall get signal and then main screen will turn on. Who's on the screen, you ask? HIM, of course!

Elimination round...

Pricklekit looked at the four cats seated in front of him. "Good job. You lost."

"Yes," Russetfur agreed.

"And you have voted off a team member."

"Indeed we have," Blackstar growled.

"Let's cut to the chase. Now you shall know who has been voted off."

"WHO?" Flametail demanded.

"Starlingpaw."

"Hurrah for me." Starlingpaw smiled at his former teammates. "Have fun at getting an actual chance of winning. There's absolutely no way you'll win the game."

"Game?" The word threw Blackstar off for a second.

"The game. You just lost it," Starlingpaw mewed as he left the game.

How interesting. Blackstar chose a female character and Sorreltail picked a gender neutral character generally referred to as a male character.
No, it was a Super Smash Bros. Brawl challenge. I used an Assist Trophy. If there is a Saffron City stage in Brawl, it's not that stage, the one in the original Smash Brothers game.
As for you, you are on the way to destruction.
Next challenge might be a regular challenge, or a special-ish challenge, or something of that nature.