Unlockables in Sonic Adventure 2 Battle:
Follow the methods below to obtain the desired unlockable:

More Karts - Complete every mission for each character (ranking does not matter) and you'll unlock the new kart for them. Simply highlight their picture on the select screen and press Up

Jewel races - Complete all 4 of the original races and get the emblem. The Jewel races will be unlocked.

Kart Racing Game - In the Hero Side story complete the Tails driving quest and then in Dark Side story successfully finish the Rouge chase mission. You will now have a playable kart racing game to play.

2P Kart Race - Simply complete both Route 101 (Hero) and Route 280 (Dark) and Kart Race in 2P Battle with become avaible.

New 2P Costumes - Complete every mission as a character with A ranking on every one of them (extremely difficult) and that character will obtain a new costume to use in 2P Battles.

Boss Attack Mode - Complete either the Hero or the Dark side story modes. Here you will be able to fight each boss from either the Hero or the Dark side

Green Hill Zone - Get all 180 Emblems and unlock the 3D version of Green Hill Zone from Sonic The Hedgehog 1.

Scene Select - Beat the story.

Last Stage In order to play the actual last and final stage of this game, then finish both Hero and Dark side story games. Once this is done, go into story mode and a ''Last Stage?'' menu selection should appear between the Hero and the Dark Side selections

Super Level on Chao Karate - Complete all three of the original difficulties in Chao Karate using the same Chao and that Chao (and that Chao only) will now have access to a Super level

Diamond & Onyx Chao Races - Win at least one race from Aquamarine, Garnet, Peridot, and Topaz Chao Races to unlock them.

Shovel Chao Toy - Win all 3 Crab Pool races

Watering Can Chao Toy - Win all 3 Stump Valley races

Toy Car Chao Toy - Win all 3 Mushroom Forest races

Rattle Chao Toy - Win all 3 Block Canyon races

Hero Chao Garden - Raise a Hero Chao with one of the three Hero characters. Continually feed and train your Hero Chao and it should evolve (creates a tear-shaped ''cocoon''). Once it evolves, ascending stairs should appear at the main Chao lobby leading to the Hero Garden.

Dark Chao Garden - Raise a Dark Chao with one of the three ''Dark'' characters. Continually feed and train your Dark Chao and soon it will evolve (creates a tear-shaped ''cocoon''). Once it evolves, the descending stairs should appear at the main Chao lobby

Maria Robotnik's Voice Theme - First collect all 180 Emblems,then link Sonic Advance to Sonic Adventure 2 Battle.Maria's voice theme should appear in the Black Market in Chao Kindergarden for 30,000 Rings.

Hidden Secretary Theme - When you are on the Theme Select screen, rotate the Control Stick Clockwise for a while until you hear a chime-like sound. You should be able to select the Secretary Theme.

Level 4 2-player games - Beat Final Rush or Final Chase in the Hero or dark side and a level 4 game should apper in 2-player mode

Unlockable Items in Sonic Adventure 2 Battle:
Ball for Hero Garden - Win the first 2 levels of the Hero race
Ball for Dark Garden - Win the first 2 levels of the Dark race
Note in a bottle - Win all 5 levels of the Dimond race
Pencil Case - Win all 5 levels of the Onyx race
Pogo Stick - Win all 5 levels of the Garnet race
Picture Book - Win all 5 levels of the Perridot race
Sonic Cudly Toy - Win all 5 levels of the Aquamarine race
Broom - Win all 5 levels of the Topaz race
Car - Win all 3 levels of the Mushroom Forest race
Watering Can - Win all 3 levels of the Stump Valley race
Shovel - Win all 3 levels of the Crab Pool race
Rattle - Win all 3 levels of the Block Cannyon Race
Ball for Normal Garden - Win the first 4 levels of the Challenge race
Radio for Dark Garden - Win all 4 Dark Races
Rocking Horse for Hero Garden - Win all 4 Hero Races
Jack in the Box for Normal Garden - Win the first 8 challenge races
Chao TV - Win all 12 Challenge Races

Guaranteed 'A' rank in Sonic Adventure 2 Battle:
An alternate way to get an 'A' rank on each stage is to collect every ring in it. It should say 'Perfect' next to your ring count at the end of the level and you will have an 'A' rank. Chaos Chao To get a

Chaos Chao in Sonic Adventure 2 Battle:
you must first have your chao reincarnate twice. Then in its third life while its a child give it one of every 21 kinds of animals. Only one of the same animal and dont give it drives then have the alignment to what you want it to be. For a Hero Chaos Chao make its alignment hero for Nuetral Chaos Chao make its alignment Nuetral. For a Dark Chaos Chao make its alignment dark. Then wait for you chao to evolve and a Chaos chao will come out of the Caccoon

Speed Up 2-Player Time Stop in Sonic Adventure 2 Battle:
When playing two player, if your opponent uses "Time Stop," press and hold forward on the control stick to make the time go faster.

Chao Traits in Sonic Adventure 2 Battle:
To raise a chao that is more skilled in either running, swimming, flying, or strength, you must feed the chao a certain type of chaos drive while a chao is still a child. For a fast running chao, feed it more green chaos drives than any other color of chaos drive. For a fast swimming chao, feed it more yellow chaos drives than any other color of chaos drive. For a fast flying chao, feed it more purple chaos drives than any other color of chaos drive. And for a stronger chao, feed it more red chaos drives than any other color of drive. But remember! Your chao must be a child! You can tell if you've done it right, if your chao starts to grow odd extentions on the back of its head.

Infinite Ring Trick:
Here is a great way to get infinite rings. Follow these steps carefully.

1. Buy any item (as expensive as you can afford)
2. Drop it in the garden.
3. Leave Chao World and Save. Repeat Steps 4 through 6 until you're satisfied with your ring amount.
4. Go back to Chao World and get your item.
5. Take it to the Black Market and sell it.
6. Now reset your game by pressing X, B, and Start at the same time.

The next time you enter the garden, the item will be there again.

Past the Level Boundary - Chao Garden:
While in the normal Chao Garden with either Sonic or Shadow, walk up to the left corner where the grass becomes rock (the one with the pond and waterfall), and start homing attacking that corner repeatedly. You will eventually leave the Chao Garden, and Sonic/Shadow will be flying above the water in the falling pose with a copy of him above him. You can now him him around, and even leave the entire Chao Garden. When you leave the area, everything will turn black and purple. To return to normal, either exit, or move back against the Chao Garden.

Re-Use animals in Chao Garden:
Use this trick to easily level up Chao:

1. Get an animal with the desired trait/Properties/whatever.
2. Take the Chao you wish to level up to the hero garden, and place it next to a fallen pillar, or take it to the dark garden and place it next to a tombstone.
3. Get a few steps away from the chao, face it, and drop the animal. If you did it right, the Chao will get the gains of the animal, but the animal can be picked up again. Repeat as many times as desired to max out a Chao's levels.

Chao duplication:
In order to do this you need both sonic adventure dx and sonic adventure 2 : battle,a link cable and a gameboy advance.

Take a chao from either sonic game and put it in the chao transporter WITHOUT a gamepak in your gameboy. When your chao is transported it will be a copy and the real one will remain in the garden you got him from. Now load up the other sonic game with your gameboy still hooked up and go to its chao garden. Go to the transporter and you will be able to get the same chao you put in the gameboy. now you have 2 of the same chao.

This trick is great if you want multiple copies of the gold and silver chao from Sonic DX. NOTE:any animal parts of your chao will return to nomal in the other gareden but hero and dark chao stay hero or dark.

2 Player speedup glitch:
Double Running Speed

In a 2 player action race Sonic and Shadow can activate a glitch that will increase your running speed. To activate the glitch get between 80-89 rings, and make sure you have a speedup. when you are ready stand in front of a point marker and then press B button to activate your speedup, directly afterwards run through the gate. your character will now run at 2x speed. to deactivate the glitch exit the level or select "No" after the race is over. NOTE:this glitch will also cause a decrease in grinding and boarding speed.

Double Grinding and Boarding speed

In a 2 player action race Sonic and Shadow can activate a glitch that will increase your grinding and boarding speed. To activate the glitch get between 80-89 rings, and make sure you have a speedup. when you are ready stand in front of a point marker walk through and then press B button to activate your speedup as soon as the lightspeed shoes appear. your character will now run at half speed,but will board and grind faster to deactivate the glitch exit the level or select "No" after the race is over.

Invincible Amy:
This only works in multiplayer. The first step is to die. Then, before you are re-spawned, Hold the B-button. If you continue to hold it, you will become invincible and kill any other player you touch.

This trick only works as long as you hold the B button down. If you release it, you will lose this glitch and have to die again to regain it.