He read the manual. I bet he could re-activate it :p

Yeah, but what would be the point of him using it, if it's gonna kill him too lol. Well, I guess he could take off his Birth Driver, attach it to Kuuga, run like hell, then come back to fight in the next round as Birth Prototype :lol

Maybe he knows he can't win and at least wants to make the match a draw? :lol

All while Shadow Moon and Kiva are waiting for their match, when suddenly an explosion goes off and they're just sitting there going "WTF just happened?!" :lolol

Well, since Kuuga has reached 10 votes before Birth even got one, I'll close this battle. Kuuga curbstomped his way into the next round!

Kuuga hands down. Birth's powers are reliant on other people/monsters. I.e. He needs cell medals to operate which come from yummies and Greeeds. He also needs OOO to back him up in his most power ful form. He should lose just because of that.

But, let's continue. Kuuga could out maneuver every attack birth has and/or tank it. Even if Birth got into his birth day state, Kuuga could go rising ultimate on his ass and own him with one punch and get through all of that machinery.

Rider Of The Year Tournament- 4th Match
 

With Kuuga's curbstomp, the results-

Century King Shadow Moon

VS

Kamen Rider Kiva

Shadow Moon:

• Wears the KingStone belt, which holds his "Stone of the Moon"
• Wields the Satan Sabre, a long powerful sword
• Wields the Shadow Sabers, twin long swords
• Can utilize the same attacks as Black
• Seen in Kamen Rider World, Shadow Moon can grow to giant size

Kiva:

• Able to perform the Darkness Moon Break, a rider kick that shifts day to night*
• Can shift into Garulu Form, wielding the Garulu Saber, giving him the ability to fight in a feral state while increasing his speed
• Can shift into Basshaa Form, allowing him to wield the Bashaa Magnum and control water, with his finisher being able to follow the opponent, due to his increased accuracy and marksmanship.
• Can assume Dogga Form, allowing him to wield the Dogga Hammer and control electricity, while also giving him super strength.
• Can blend the three forms and become DoGaBaKi form, allowing him to access the 3 weapons.
• Can attach the Buroon Booster to his motorcycle, allowing it to increase speed.
• Can summon the Castle Doran and Shoodoran, dragons to aid him in battle.
• Most Powerful Form: Emperor Form
• As Emperor Form, he becomes exponentially stronger, able to use Tatsulot to use several “Fever” attacks and can assume Flight Style, a dragon like creature known as the “Emperor Bat.”
• Wields the Zanvat Sword

This battle closes tomorrow!

Go kiva!

Now this is a good one. Kiva is a pretty versatile Rider but Shadow Moon is a huge powerhouse. I don't think this one comes down to that, though, as I'm pretty sure that after a few seconds Kiva would realize what he's up against and pull out Emperor form, making this a sheer power vs. power match up. At that point I think it becomes a fairly even fight, especially since the Satan Saber and Zanvat Swords are virtually identical in how they boost their users' power (although I'd give the Satan Saber an edge since it doesn't need to be fluffed to reach its full potential). Although Shadow Moon isn't the most crazy or even skilled fighter at this point, I think he does have one weapon that would totally level the playing field: Shadow Flash. Just like Black's King Stone Flash, this move works by sapping the strength and defenses of anyone hit by it. Top that off with a Shadow Kick and Wataru's going to need a pretty long sulk in the tub to recover.

I went with Kiva since no matter how strong a villian is the hero always wins.