I looked around and found this as part of an FAQ on the game, which can be found here:
http://www.gameadvice.com/cgibin/faq.cgi?game=k/KingOfFighters99-Gunsmith.txt
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-The Belly Button Flasher Team :
Blue Mary, Benimaru, Athena & Leona
-The New & Old Team :
Iori, Kyo, K', Shingo
-The Kids Team :
Xiangfei, Shingo, Bao, Kensou
-The Masters Team :
Takuma, Jhun, Chin, Kim
-The 3 Loads Team :
Shingo, Shin Kyo, Kyo-1, Kyo-2
-The Kamikaze Killer Team :
Maxima, Ralf, Bao, Chang
-The Awesome Hairstyle Team :
Chang, Benimaru, Jhun and Andy
-The Short Cut Team :
Blue Mary, Whip, Athena and King
-The Hatters team :
Terry, Clark, Bao, Choi
-Whip and Disciples Team :
Whip, Iori, Shin Kyo, Benimaru
-Ryuko no Ken all stars team :
Ryo, Robert, Yuri, Kasumi (as long as you have substituted one of
the Ryuko no Ken team with someone from Ryukonoken series,
which in this case I subbed Takuma with Kasumi)
-Garou Densetsu all stars team :
Same as above (but instead use Garou Densetsu team)
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Have fun!
