Tekken Cheats - GBA

All modes and characters
Hold [A] + [B] and press [L], [R]x2, [L]x2, [Up]x2, [R] at the main menu. Note: You may need to repeat this two or three times before it activates.

Alternate costumes
Press [L], [R], or [Start] at the character selection screen.

Switch fighters
Press [R] at the versus screen in tag team mode.

Fight as Heihachi
Successfully complete the game with all nine characters. Heihachi will appear next to Hworang and Paul at the character selection screen.

Team battle modes
Successfully complete arcade mode as Heihachi to unlock the and Versus Team Battle options.

Make Hwoarang dance
Because the Disrespect move is [Left], [A] + [B], keep it and you will see Hwoarang doing a 70s-style boogie dance.

Hammer technique
With Jin or Heihachi, do the Tsunami Kick when an opponent is doing an attack that involves jumping. It looks appears that they are kicked up, then suddenly hammered down. This sometimes works when the opponent is crouching.