In order to change the game into Dragon Ball Z Ultimate Battle 27 when the
title screen (with Ultimate Battle 22shown) comes up, triangle, down, X, 
right, L1, left, R1. You'll hear a sound and it'll load a new visual.

Type right, up , left, o , twice x, then press down, and the screen will turn 
yellow, and then you will get two more players.

Meteo Smashes & cool fire techniques for the new characters 
(And a few old ones!):

Super Saiyan 3-
Meteo: B,F,D,U+Punch button

Super Saiyan Gogeta-
Meteo: B,BD,D,DF,F,FD,D,DB,B+Punch button
Triple Fire: F,FD,D,DB,B-twice,F+Fireball button

Mr. Satan-
Meteo: F,DF,D,DB,B,DB,D,DF,F+Punch Button
6 Pack Missiles: F,DF,D,DB,B,F+Fireball Button

Kame Sennin-
Meteo: F,DF,D,DB,B,DB,D,DF,F+Fireball Button
Pulse Fire: F,FD,D,DB,B+Fireball Button

Piccolo Daimaoh-
Fireball Pets: F,DF,D,DB,B-twice,F+Fireball Button

Trunks-
Machinegun Fire: B,DB,D,DF,F-twice,B+Fireball Button

Super Gokou-
Warping Kamehameha: F,DF,D,DB,B,F+Fireball Button

Ginew-
Soul Exchange: F,DF,D,DB,B-twice,F+Fireball Button
Self Damaging Exchange: Reverse of Soul Exchange