Is there anything that can be done with IR that cannot be done with WIFI?

[cbowling816]

I want to know if I need to carry my Black/White game with me like I do my soulsilver, or if I can just use my dump of B/W

Basically I want to know if there are any ITEMS that can only be gotten thru InfraRed

also pertaining to the C-Gear, and Battle Subway, can I do everything thru WIFI, or are there any IR exclusive features?

[Delta Blast Burn]

Trading is alot easier via IR, but other than that I dont think there should be any impossible to obtain items or otherwise.

[FF9ZidaneGal]

I dunno about items but I know it's the only way to do that friend Checker thing. Lol but that's probably about it and making it easier to trade pokémon between games.