Invulnerability (being invincible or not able to be hurt or damaged): A, B, A, Up, Left, Down, Right
Unlimited Boost: B, A, Down, Up, B, A, Down
The Last 3 Cars: 1, 2, 1, 2, B, A, Plus
Monster Truck: B, Up, Minus, Plus, 1, Up, Plus
Aggressive Opponents: Up, Left, Down, Right, Up, Left, Down
Pacifist (don't hurt others) Opponents: Up, Right, Down, Left, Up, Right, Down
Tiny Opponents: B, A, Left, Down, Minus, Up, Minus
Helium (gas that make the voice high and squeaky): Minus, Up, Minus, 2, Minus, Up, Minus
Moon Gravity (slightly floating):Up, Plus, Up, Right, Minus, Up, Minus
Psychedelic (colorful lights): Left, A, Right, Down,B, Up, Minus
Hope this helps!
P.S. I might have forgotten a couple but I remember they weren't really important or fun
yes
you use a USB chord
go to www.codejunkies.com and www.supercheats.com to find out AR Pokemon Diamond/Pearl codes for the DS
yes
No there are not yet.
Um I don't but if you buy AR DS theres lots of codes like playing as peach or bowser if that's what your talking about
621342342343334242e4e3242342342300000000000000000000000000000000000000000
You need a DS Toolkit.
There are a million of them, look them up at codejunkies.com
You need the Trainer Toolkit.
You need to have an action replay device.
Most likely yes considering dsi plays the same ds games as a normal ds so they;d probably have the same codes. if not then idk why....it'd be stupid to change them in a way