Knockout mode:-  Successfully complete the game in movie mode.

Fight as Rocky Statue or Apollo Max:-  Successfully complete the game in knockout mode.

Fight as Apollo Max:-  Successfully complete the game in knockout mode under the hard difficulty setting.

Gameshark Codes

Enable Code (Must Be On) 9482164C 434A  D4392CF3 B042  8147E98E 4FE6
Skip Training 3AECE6F1 0EE2
Stop Timer 673B3D07 9D82
Press Select For Instant K.O. 7AFC6F5A 0E8E  27EBE4F4 0EE6
Unlock Knockout+All Boxers [Note 1] BEE8F6E9 0FE0
Infinite Health 27C1C875 6270
Maximum Health 2BFE1FD0 0C94
Infinite Stamina 76D329DC 38C7
Maximum Stamina 54C3E8ED 736B
Strength 6BD423D9 28D3
Stamina 49D42359 289B
Speed 63D721DD 28D3
Guard 41D7215D 289B