Dragon Ball Z: Budokai Tenkaichi 2 Cheats - Wii

Unlock Characters
100% Full Power Frieza - Super Transformation + Final Form Frieza
Android 13 - Computer + Hatred
Android 13 Fusion - Android 13 + Parts of 14&15
Baby Vegeta - Baby + Vegeta (second form)
Bardock - Defeat Lord Slug Saga
Bojack - Unsealed + Galactic Warrior
Broly - Son of Paragus + Hatred of Goku
Burter - Defeat Burter and Jeice with Goku
Cell - Defeat Cell with Piccolo and Android 17
Cell (2nd Form) - Defeat Cell (2nd Form) with Trunks and Vegeta
Cell (3rd Form or Perfect Form) - Defeat Cell (Perfect Form) with Gohan
Cell (Perfect or Perfect Cell) - Self Destruction + Cell Perfect Form
Cell Jr - Defeat Cell Jrs (5) with Gohan
Cooler - Frieza's Brother + Hatred of Goku
Cooler Final Form - Super Transformation + Cooler
Cui - Vegeta's Rival + Frieza's Soldier
Demon King Dabura - Defeat Dabura with Adult Gohan
Doboria - Defeat Doboria in Dragon Adventure
Dr Gero - Defeat Dr Gero with Krillin
Evil Buu - Evil Human Cannonball + Majin Buu
Full Power Bojak - Ultimate Transformation + Bojack
Garlick Jr. - Makyo Star + Dead Zone
General Tao - Bros. of Crane Hermit + Memorial Campaign
Giant Lord Slug - Slug + Giant Form
Ginyu - Defeat Ginyu (with Goku's body) and Jeice with Krillin, Vegeta, and Gohan
Gohan Super Buu - Gohan Absorbed + Evil Buu
Gotenks - Defeat Buu (Pure Evil) with Majin Buu and Hercule
Gotenks Super Buu - Gotenks Absorbed + Evil Buu
Grandpa Gohan - Master Roshi's pupil + Fox mask
Great Ape Baby - Super Baby 2 + Artificial Blutz Wave
Great Ape Bardock - Power Ball + Bardock
Great Ape Nappa - Power Ball + Nappa
Great Ape Raditz - Power Ball + Raditz
Great Ape Turles - Power Ball + Turles
Great Ape Vegeta - Power Ball + Vegeta (Scouter)
Great Saiyaman (Gohan) - Defeat Zangya and Bojack with Teen Gohan
Great Saiyaman 2 (Videl) - Defeat Broly with Goten and Adult Gohan
Guldo - Defeat Guldo with Vegeta, Krillin, and Gohan
Hercule - Defeat Perfect Cell with Super Trunks
Hirudegarn - Hirudegarn's Top Half + Hirudegarn's Lower Half
Janemba - Saike Demon + People's Bad Energy
Jeice - Defeat Jeice and Ginyu (with Goku's body) with Krillin, Vegeta, and Gohan
Kibitoshin - Kibito + Supreme Kai
Kid Buu - Defeat Kid Buu with Goku and Vegeta
Kid Goku - Defeat Grandpa Gohan
Legenday Super Saiyan Broly - Super Saiyan Broly + Breakthrough the Limit
Lord Slug - Namekian + Mutation
Majin Buu (Pure evil) - Human gunman's gun + Majin Buu
Majin Vegeta - Defeat Majin Buu with Supreme Kai and Gohan
Majin Vegeta - Defeat Buu with Adult Gohan + Supreme Kai
Majuub - Defeat Super Baby 2 with Pan and Uub
Master Roshi - Defeat Raditz with Goku
Master Roshi Full Power - Master Roshi + Seriousness
Mecha Frieza - Reconstructive Surgery + 100% Full Power Frieza
Metal Cooler - Big Gete Star + Cooler
Nappa - Defeat him in Dragon Adventure
Omega Shenron - Syn Shenron + Ultimate Dragon Ball
Pan - Defeat Hirudegarn with Tapion and Kid Trunks
Pikkon - Defeat Pikkon with Goku
Recoome - Defeat Recoome with Goku and Vegeta
Salza - Coolers Soldier + Armored Cavalry
Super Android 17 - HFIL Fighter 17 + Android 17
Super Baby 1 - Baby Vegeta + Lower class Saiyan
Super Baby 2 - Super Baby 1 + Power from lower class
Super Buu - Defeat Super Buu with Ultimate Gohan
Super Buu Gohan absorbed - Absorb Gohan + Super Buu
Super Buu Gotenks absorbed - Absorb Gotenks + Super Buu
Super Garlic Jr. - Garlic Jr. + Giant Form
Super Gogeta - Defeat Super Janemba with Pikkon + Buu
Super Gotenks - Defeat Pure Evil Buu with Buu + Hercule
Super Janemba - In item fusion combine Janemba + Ultimate Transformation
Super Perfect Cell - Suicide Bomb + Perfect Cell
Super Saiyan 1 Teen Gohan - Defeat Perfect Cell with Super Trunks
Super Saiyan 2 Goku - Defeat Majin Buu w/ Supreme Kai and Adult Gohan (Buu Saga)
Super Saiyan 2 Teen Gohan - Defeat Cell Jr. (5) with Super Saiyan 1 Gohan
Super Saiyan 2 Vegeta - Defeat Buu(Gotenks absorbed) with Goku
Super Saiyan 3 Goku - Defeat Majin Buu with Majin Vegeta
Super Saiyan 3 Gotenks - Defeat Super Buu with Gotenks
Super Saiyan 4 Gogeta - Defeat Omega Shneron with Super Saiyan 4 Goku and Vegeta
Super Saiyan 4 Goku - Defeat Super Baby with Majuub
Super Saiyan 4 Vegeta - Defeat Omega Shenron with Super Saiyan 4 Goku
Super Saiyan Broly - Broly + Super Saiyan
Super Saiyan Goku - Defeat Freiza Final Form w/ Piccolo, Krillin, and Kid Gohan (Freiza Saga)
Super Saiyan Goten - Defeat General Tao with videl and Great Saiyaman
Super Saiyan Kid Trunks - Defeat General Tao with videl and Great Saiyaman
Super Saiyan Trunks - Defeat 2nd Form Cell with Tien
Super Saiyan Trunks (Sword) - Defeat Androids 17 and 18 with Gohan
Super Saiyan Vegeta (Second Form) - Defeat Vegeta with Super Saiyan Teen Trunks (Buu Saga)
Super Trunks - Defeat Perfect Cell with Super Vegeta
Super Vegeta - Defeat Cell Form 2
Super Vegetto - Defeat Super Buu (Gohan Absorbed) with Goku and Vegeta
Supreme Kai - Defeat Android 18 with Hercule
Syn Shenron - Evil Dragon + Negative Energy
Syn Shenron - Evil Dragon + Negative Energy
Tapion - Defeat Tapion with Trunks and Goten
Trunks - Unlock History of Trunks Saga
Turles - Lower-Class Saiyan Soldier + Fruit of the Gods
Ultimate Gohan (Mystic) - Defeat Buu with Piccolo or Super Saiyan 3 Gotenks
Uub - Defeat Hirudegarn with Super Saiyan 3 Goku
Vegeta (2nd Form) - Defeat Vegeta w/Super Saiyan Teen Trunks(Buu Saga)
Vegeta (Post Namek) - Defeat Metal Cooler w/ Super Saiyan Goku(Return of Cooler Saga)
Vegetto - Defeat Super Buu + Gohan with Goku and Vegeta
Videl - Defeat Android 18 w/ Hercule (Buu Saga)
Videl - Befeat Bojack and Zangya with Piccolo + Gohan
Yajirobe - Defeat Great Ape Gohan with Piccolo
Zangya - The Fowers of Evil + Galactic Warrior
Zarbon Post-Transformation - Unsealed + Zarbon

Unlockables
Without these, 100% completion cannot be attained in story mode, they're special sagas that become avaliable when an "impossible" battle is won. Usually these aren't beatable with the first time, so they're best attempted after story mode has been completed and your characters have leveled up:

Beautiful Treachery - Defeat Dodoria with Gohan and Krillin in mission 01 of the Frieza Saga "A Pursuer Who Calls Death"
Destined Rivals - Defeat Gohan with Goten in mission 01 of the Majin Buu Saga "Training With Goten"
Fateful Brothers - Defeat Raditz with Piccolo in mission 00 of the Saiyan Saga "Mysterious Alien Warrior" (first mission of the game)

Bra (Training Mode)
To get Bra at the start screen of Training Mode, instead of Bulma, complete all of the Basic Training.

Wii Exclusive Characters (European, Australian and Japanese versions)
In the European, Austrailian or Japanese versions of the game, you can unlock 6 extra secret characters by playing through Ultimate Battle Z mode:

Appule - Complete Course 4
Cyborg Tao - Complete Course 6
Demon King Piccolo - Complete Course 8
Frieza Soldier - Complete Course 2
Pilaf Machine - Complete Course 10
Pilaf Machine Combined - Complete Course 10

Fight Intruders in Ultimate Battle Z
Some towers in the Ultimate Battle Z mode have hidden battles that require specific conditions to trigger. They are only available in the difficulty level 3:

Fight Brolly Legendary SSJ in Saiyan Blood - Defeat Bardock with an Ultimate Blast
Fight Goku SSJ2 and Vegeta (Second Form) SSJ2 in Dragon Tag 2 - Defeat any opponent with an Ultimate Blast
Fight Hercule in Unlimited - Defeat Gogeta SSJ4
Fight Omega Shenron in Ultimate Dragon - Defeat Syn Shenron with an Ultimate Blast
Fight SSJ3 Gotenks in Ultimate Children - Defeat Kid Goku with an Ultimate Blast
Fight Super Baby 2 in Normal-ism - Defeat Super 13 with an Ultimate Blast
Fight Tao Pai Pai in Assault Force! - Defeat any opponent with an Ultimate Blast
Fight Uub in Kakarot Road - Defeat Kid Buu with an Ultimate Blast

"What If" Sagas
Without these, 100% completion cannot be attained in story mode, they're special sagas that become avaliable when an "impossible" battle is won. Usually these aren't beatable with the first time, so they're best attempted after story mode has been completed and your characters have leveled up.

Beautiful Treachery - Defeat Dodoria with Gohan and Krillin in mission 01 of the Frieza Saga "A Pursuer Who Calls Death"
Destined Rivals - Defeat Gohan with Goten in mission 01 of the Majin Buu Saga "Training With Goten"
Fateful Brothers - Defeat Raditz with Piccolo in mission 00 of the Saiyan Saga "Mysterious Alien Warrior" (first mission of the game)

Great Ape
Get 100% achievement ratio in Dragon Adventure.

Member's Card (Gold)
Get 100% achievement ratio in Dragon adventure.