What do you use the rebooter for?
It can be used for Multi DOL games, like Super Smash Brothers Brawl. In addition, it can allow for region free booting from the Disc Channel, copying any save to your SD card, etc. Unfortunately, it will not work if you are on the '3.3V2' firmware or higher.
I have 3.4u wii and gecko os can I play tatsunoko vs capcom?
If you boot the game through GeckoOS, it should work. However, since you are on 3.4U, the Rebooter function of GeckoOS will not work.
So, tastsunoko should play on my wii? and I can save ( game data) it to my hard drive in the wii?
I don't have the game, so I can't guarantee with certainty that it will. However, it should more than likely work. Also, yes, you will be able to save your data to the Wii console.
Thank you very much! :D