Celebi
had better be catchable! (please, Nintendo? :)). It is one of the few Pokemon barring people from National Pokedex completion these days. Personally, I'd
really like Celebi (and all other event Pokemon) to be catchable
in-game. Not all people with DPPt and a DS have Wi-Fi access. (Heck, I haven't even entered Gen. 4 yet! :() Game Freak would just have to make the process of obtaining Celebi in-game really harder!
However, I suppose Celebi being obtainable via Wi-Fi for HG/SS is a blessing in itself, as a Wi-Fi event (accesible to all players with Wi-Fi) is
much better than actual Nintendo events which require arduous travel. I mean, we've already had to pay enough for the game itself; paying extra for easily losable data is just wrong. (just like the infamous 'horse armor' in
Elder Scrolls IV: Oblivion for XB360 :cer_no:). Even with Pokemon given over Wi-Fi, you still have to pay monthly for continued Internet access to even obtain such Pokemon... (plus you'd have to purchase a Wireless Adapter if you haven't had Wi-Fi previously, in some cases)
In-game 'Event' Pokemon FTW!