Hi hiroyuki718,
currently there is only one WiFi game that offers online play for Nintendo Wii:
Mario Strikers Charged Football.
It is a great game though! - and others will be on their way soon!
Hope this helps!
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Too keep up to date on this, keep an eye on this Wikipedia page:
http://en.wikipedia.org/wi
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by: MASQUERAIDPosted on 2007-09-16 at 09:24:57ID: 19900845
Fully implemented (link to DS or online play):
Pokemon Battle Revolution - only worth considering if you have Pearl already otherwise you have limited character choice.
Already with some online play coded:
Metroid Prime 3: Corruption - released without it enabled :(
Super Smash Bros. Brawl - WiFi not implemented :(
In the pipeline:
Animal Crossing
Battalion Wars 2
Far Cry: Vengeance
Mario Strikers Charged
There may be some others I've missed.
Nintendo seem to be cautious about getting online play right so there is very little at the moment.