It was a little buried by all the excitement over WiiWare demos yesterday, but Pokemon Rumble has some surprises of its own. The new WiiWare game allows unlockable pokemon via code, and two releases are already available.

One was mentioned in the weekly Nintendo Download press release. If you buy the game and have synced your Club Nintendo account, you will get an email in about a week with a secret code. Nintendo has the details here. They don’t say exactly what the code unlocks, but there’s a picture of a Charizard. So I’m thinking Charizard. This offer expires next April.

Note that Nintendo’s info page at this writing still thinks Pokemon Rumble is only 1000 Wii Points. It’s actually 1500. I smell a last-minute price hike.

The second code can be found by watching this week’s edition of Nintendo Week via the Wii’s Nintendo Channel. Host Alison has a Rumble interview and the guest reveals the eight digit code that will net you a Blastoise. Following the trend here of Final Evolutions of Gen 1 Starters, I’m going to guess that a Venusaur will be made available through Nintendo Power or wherever.

Pokemon Rumble features the entire original cast of 150 Pokemon, but it seems plain that the hooks are there to add in the remaining 330+. It just remains to be seen how Nintendo will add those guys in and what it will cost.

Incidentally, the game is pretty much Li’l Diablo.