Because he is a silent protagonist and a main character of the game. Plus he's too busy killing aliens and combines.
the answer above is wrong: the ACTUAL reason is because if you search through the GCF a sound file says "Voice System Deactivated"with the voice of the HEV suit.
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Gordon Freeman
First its Groudon. When You Beat The Elite Four You Go To The Weather Instetute (Est of fortree) Then Talk To The Guy Upstairs Then He Will Tell you a route like 127 But you can catch Kyorge to. If Its Gordon ( A Pokemon I Never Heard Of Then This Is A Bad Anser Just Telling You Ok) ^_^
yes the revenge of riley freeman is real i got it on the xbox360 its fun you should ge t it
u first need to talk tyo jasmine in the light tower then go to the guy that gives it to you that's the only that he give you the super potion
it doesnt..