
Saying that Pokemon Rumble is one of the strangest Pokemon spinoffs is probably an understatement. It's a Pokemon inspired brawler (...pause for effect) that stars wind-up toy Pokemon instead of actual Pokemon. It's a fun, shallow (read: repetitive) gaming experience that has a very unappealing price-tag and not a whole lot of substance.
In this Pokemon outing players do not take control of a trainer and roundup a team of Pokemon. At the start of this little journey players start off as weak Ratatta that tries to prove its strength by sneaking into a Battle Royale arena. Things don't work out too well for the toy Ratatta, so he has to go out and befriend stronger Pokemon so that together they can rise through the ranks of the Battle Royale, and become known as the strongest toy Pokemon.
Befriending other Pokemon is done by going to one of the game's six levels and beating up every Pokemon in sight. If a Pokemon falls onto its side you can walk into it and collect it like a battle trophy, which also mean that Pokemon is your new buddy and will join your quest to win the Battle Royale. The majority of the Pokemon will just disappear once their HP hits zero leaving nothing behind except for some coins, which can be used to buy things such as previously encountered Pokemon. The toy Pokemon do not evolve; no matter how much you use your Bulbasaur, it isn't going to become an Ivysaur. If you want the evolved form of a Pokemon, you'll have to go out and find it. You can have up to 1000 Pokemon at a time, but good luck finding the Pokemon you want to switch to in a timely manner.

The six levels do not change as one progresses through the game, they are same from rank C all the way to rank S. Different Pokemon do appear in different ranks. Each of the six level have their own theme and corresponding Pokemon. Go to the beach level and you'll encounter a ton of water Pokemon. At the end of each level is a boss battle against a giant version of a Pokemon as well as continuously re-spawning normal Pokemon.
Gameplay can get repetitive even when switching between Pokemon, because you'll still be walking around spamming an attack. Pokemon can learn new moves, up to two at time, for a price and also at random. Sometimes you'll fork over your money and get a good move, and then there will be times that you'll spend every last cent and get nothing but useless moves, or moves that you already know. You'll also be doing the same thing over and over, which is continuously playing through each level until you befriend a Pokemon with a power level that is high enough to open the current rank's Battle Royale.
Pokemon Rumble does feature all of the generation one and generation four Pokemon, and they can all be collected. If your favorite Pokemon is limited to generations two and three, then you're out of luck. Shiny Pokemon are also obtainable, but are also very rare like they are in the main series. The game also features co-op so up to four people can team up and beat down other toy Pokemon.
If you're a Pokemon fan then you'll probably enjoy this game, but don't expect it to last you as long as one of the main games. By the time you reach the end of game the charm starts to disappear, and unlocking the generation four Pokemon isn't a big enough incentive to replay the game. The game running for 1,500 Wii Points - $15 exactly – is also a big turn-off, but luckily there is a demo available. It's can be fun, but there are better WiiWare titles available.