Pokemon Battle Revolution
Pokemon Battle revolution is a game for the wii which features brilliant 3D graphics, online play, DS link-up and more battles than you can shake a wii remote at.

Battle Revolution has lots of different colosseums which you can battle in, and each has it's own set of rules.
The colosseums are :
Gateway Colosseum
Main Street Colosseum
Waerfall Colosseum
Neon Colosseum
Crystal Colosseum
Sunnny Park Colosseum
Magma Colosseum
Sunset Colosseum
Courtyard Colosseum
Stargazer Colosseum
I have also seen a Battle Revolution kit on the net. Take a look.
Cool !
It includes a special remote jacket and also a nunchuk jacket as well.
You can buy it at :
http://tinyurl.com/yqjtcu (Barnes & Noble)
Battle Revolution has received some pretty medicore reviews, but it is still a good game if you own Diamond or Pearl as well.
After you complete Pokemon Battle Revolution, you can get a free Pikachu. That might not sound very good, but this particular Pikachu knows Surf and Volt Tackle, which is a combination of moves which used to be unavailable.
Tips
I have finished Pokemon Battle Revolution AND It is quite hard in places. Here are some tips to help you out.
1.) Use pokemon from Diamond & Pearl. This is pretty much the best thing you can do to help yourself. With a decent set of hard-hitting pokemon, it becomes a simple matter of winning when you get to the Custom Pass Knockout and League battles.
2.) DO NOT use a custom pass when you attempt the Fortune battles, you will get thrashed sooner or later when your opponent gets all of your great pokemon, and you are left with terrible pokemon (this tip only applies if you have good pokemon on your team eg. Garchomp, Dialga, Salemence, Palkia, Regice).
wi-fi
If you can get wi-fi, don't go on to the WFC expecting that you will get some easy scraps, because you won't. Using my OK team of non-EVed legendaries (I can't be bothered to do EVs, but I would if I got a decently IVed pokemon for ONCE, just once), I went on the net and half-expected someone amazing to come along and battle me. But they didn't. At least, not for a while, because I was stuck battling Nate for what seemed like an eternity, then I struck the jackpot. My Dialga, Heatran, Giratina and Garchomp were no match for a properly constructed team. Well at least, we were doing pretty well until my Garchomp met Shuckle, and the toxi-stalling stratergy proved too much for the great land-shark. I also met one guy with the cheek to carry a Wobuffet. He also had an ice type, so I was pretty much done for. "But you had Heatran !" I hear you cry. I did, but that particular ice-type was Mamoswine. Oh dear. I have met a few people using pokemon like Groudon, Mewtwo, Lugia and Rayquaza, thinking that they would win every battle using sheer force, and Groudon's Fissure. My ice beam absolutely crushed Rayquaza (you have to carry ice beam on Wi-Fi battles on Pokemon Battle Revolution or you will get defeated by the dragons and Groudon. It is also very good for non-ridiculously powerful pokemon, because Ice Beam is a good, reliable move after all), dealt with most of Groudon, Shadow Force wiped out Mewtwo, Lugia was suprisingly weak to Thunderbolt, and I had won the battle. I can imagine the look of utter dismay on his face when I won. I was lucky enough to meet a guy with a shiny Flygon and a shiny Froslass which had absolutely no EVs in speed, but were probably better than my shiny Victreebel.
That brings me on to perhaps my favourite thing about Revolution's Wi-Fi battling: friend passes. I got the friend pass from that Shiny pokemon guy, and although you can't use them for colosseums, you can let your friends marvel at the sheer greatness of the pokemon of people you have battled with, even if the pokemon are just a troop of Cleffas, or even worse, the dreaded rental pass (talking about rental passes, blue is slightly better in my opinion, but you can get through the many colosseums without the better one, don't worry).
A thing that really annoys me is people who give up. Even worse if they give up straight away, after they've taken one look at your pokemon. It's just a complete waste of both people's time. I know you reading this is paragraph is a complete waste of your time, but be warned: if you battle me...* Okay ?
*DO NOT do that
However, the best thing about the Wi-Fi is the actual thing itself, or rather the fact that it allows you to play against "someone" (that means no friend codes). Yipee ! I love it ! It is much better than even the main game, because you can play against a real person, non-AI, 0% CPU; who makes mistakes, real mistakes, not CPU random move stratergies. Now that is a true advance in the spin-off games. Yes, Revolution is a spin-off game, but it is a good one, at least.