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cc (D059/8 hex:xx; actual hex:yy) is a valid trainer class in Pokémon Red, Blue, and Yellow. The cc class consists of x valid rosters in Red/Blue and x valid rosters in Yellow, which differ between Red/Blue/Yellow.
The other x (Red/Blue) and x (Yellow) rosters are glitch trainers, with roster data from Trainer classes proceeding the cc class.
cc can be fought with the Ditto glitch sub-glitch of the Trainer escape glitch with a Special stat of ss. The last Attack stage of the foe (starting at 07: neutral and can be reduced to 01 with an Attack lowering move, i.e. Growl used against foe or up to 13 with an Attack raising move, i.e. Swords Dance used by foe) will determine the roster.
cc can also be fought in Red/Blue using the unavailable 0x[xx] character as the third, fifth or seventh old man trick name (possible in theory with Super Glitch, or possible with arbitrary code execution), but will use the rosters of (Random name) "Jacred" (00) instead if fought this way. The team used depends on the last value of the roster address D05D.
Pokémon Red and Green rosters
Pokémon Red and Blue rosters
Pokémon Yellow rosters