I have a whole crap load of glitches from these games to share. I don't have screenshots but I plan on getting some as well as Youtube videos too. I'll start in order of release:
Legacy of GokuWell first of there is the Infinite health glitch (well sort of anyways). Here's what you do:
First You have to have some energy in your flight meter
After that you must then fly while an enemy charges up a Ki Blast. fly directly into its path so you get hit by it
You'll take a significant amount of damage doing this so make sure your health is full otherwise you risk dying.
when you get hit by the Ki Blast you'll be standing on the ground with the Flight noise infinitely looping. Your healt and Ki meters will not be visible because the game still thinks that Goku is flying even though he is walking on the ground. This means that the flight meter is visible instead.
Enemies will follow you at close quarters but will not attack due to the fact the game still thinks you are flying. This effect lasts until you fly again. The sound will remain regardless if you revert out of this glitch or not. The other sounds will play but the flight noise can be heard in the background and it will remain that way until you shut off the game.
Legacy of Goku III've got quite a few glitches for this game. I spend a lot of time playing this game or at least I used to.
Make Perfect Cells Kamehameha Disappear
Alright this only works during the first half of Goku's fight with Perfect Cell in the Cell Games. (When the are in the Budokai stadium)
When Cell uses his Kamehameha wave simply press R to open the Scouter map and close it to make Perfect Cell's Kamehameha wave Disappear (Except for the part that damages. The front of the beam. Must be a seperate sprite than the rest of the beam.)
Over 100 in stats as Super Saiyan/ Super Namek
Unfortunately there are not enough upgrade capsules to do this with ever character but you can max out at least two character's stats. (Not every one of them though.)
The sad part with this is only one character gets two stats maxed out when you do this. The other one gets only one stat maxed out.
Here is what you do: First you must not use any Stat capsules to raise a character's stats for the whole game until at least one character is at level 50. Save any capsules you find until then.
Once a character is at level 50 give him as many capsules as it takes for him to reach Maxed out stats. (100) There are not enough Endurance capsule to get to one hundred endurace but you can get to 98. In my opinion the best character to max out stats with is Gohan as I find him fun to use in his first fight with Cell.
Now that the character's stats are maxed out have them Transform into their Super State. Since The super state adds 10 to every stat you get a 110/100 in the stats that are maxed out. (105/100 if you did this with Piccolo.)
This probably isn't a glitch but then again why doesn't Gohan get an even bigger boost with his Super Saiyan 2 rage during the fight with Cell? Well I guess it is more of a programming oversite than a glitch. Oh well
Super Saiyan Gohan at the end of the game.
Before seeing the ending switch to Gohan and make him go Super Saiyan. then fly to Kami's Lookout and watch as Gohan is a Super Saiyan at the end of the game. when the game fades into the credits the Super Saiyan sound persists and it will stay there until the game is shut off.
Buu's Fury255 Senzu Beans
Alright to do this you need to be after the part of the game where Spopovitch brutalizes Videl. Gohan asks Goku to get a Senzu Bean from Korin.
After obtaining the Senzu from Korin exit to the world map and your Journal will be updated.
While on the world map eat the Senzu Bean and Fly back to the World Games and talk to Gohan.
Gohan will take the Senzu Bean even thought there isn't one in your inventory anymore. When you look in your inventory after this you will have 255 Senzu Beans!!!
Edit: Here is a video of this Glitch:
http://www.youtube.com/watch?v=r4Llzu0Yv3kVegeta is Talking to Himself? WTF???
To do this progress through the game until you get to Kid Buu. Before facing Kid Buu fly to a save circle in an area other than the wastelands.
Once there switch to Vegeta and fly to the Wastelands and Press yes if you are asked if you are ready to confront Kid Buu.
Once there The Text of Goku and Vegeta's Conversation will be the same however Vegeta's picture will be shown for both Goku's and Vegeta's lines making it appear Vegeta is Talking to himself.
I knew Vegeta had problems but I didn't know they were that bad. lol.
FU-SION- OOPS! GAME CRASH!!!
to do this simply perform a fusion and mess it up while standing on a flight circle. Then while the fat or Skinny Gotenks/Gogeta is still fused standing on the Flight Circle press A and the graphic of the sprite will glitch up on take off and the screen will go black with the music hanging.
Save Circle Bug
Commonly known about, this glitch allows you to fight enemies and save your game at the same time. (No wonder why no enemies are found near them in Legacy of Goku II)
This allows for some easy leveling up but I find it slower than the regular way. But hey if you are having trouble killing enemies in the area because your level is too low this isn't to bad.
Fusion Save Circle Bug
as with the bad fusion on the flight circle Glitch mentioned earlier there is also a form of that glitch for the save circle (Minus the game Crash of course.)
Glitchy graphics on the Title screen as a result of Fusing incorrectly on a save circle and saving appear as well and seem to trigger some weird effects. One time for whatever reason a save file that had been deleted recovered itself in place of the game with the fusion mishap saved. When I shut off the game and turned it on my save file with the Glitchy graphics was still there.
Update: Savefile recovery incorrect. Not true. I made a mistake on that. Sorry about that.
Well I'll edit this post if I find anymore Glitches so until then later.