Simple 1500 Series Volume 32: The Boxing Cheats - PlayStation

Asteka
Unlock Spice, then defeat Asteka in scout mode to unlock him in arcade mode.

B.T.
Defeat B.T. in scout mode to unlock him in arcade mode.

Gio
Unlock Silver Man, then defeat Gio in scout mode to unlock him in arcade mode.

Kojiromaru
Unlock Gio, then defeat Kojiromaru in scout mode to unlock him in arcade mode.

Misha
Unlock Prince, then defeat Misha in scout mode to unlock her in arcade mode.

Prince
Unlock Puma, then defeat Prince in scout mode to unlock him in arcade mode.

Puma
Unlock B.T., then defeat Puma in scout mode to unlock him in arcade mode.

Silver Man
Unlock Misha, then defeat Silver Man in scout mode to unlock him in arcade mode.

Spice
Unlock Kojiromaru, then defeat Spice in scout mode to unlock her in arcade mode.