No i don't think so.
Yes. If you have a code for the Pokemon Modifier, you can toss an amount of the Master Balls (If data is correct, is should work.) Get the code and you will be able to get the staters.
it shows the data of Pokemon
The 4th Generation Pokemon games were never programmed to include data from Black and White. Thus, it is impossible to have a Reshiram on Pokemon Diamond without massively modifying the files and possible lawsuits from Nintendo for violation of product usage.
you don't usually need any code if the data from Pearl or Diamond are on there just use the cheats from those options
No, telephone area codes are discrete data.
you cant!!
ummmmmmmmm deleat youre game
only if you hack it
Mewthree cannot be caught in Pokemon Diamond, even with an Action Replay, because it does not exist in the game's data.
no maybe if you hacked
It varies by the type of code. Some require a certain button to be pressed, at which point the pokemon's data is written to a specific slot in your PC, while others activate events and will require you to pick up the pokemon from the delivery man in the pokemart. Encounter codes work differently still by altering what pokemon appears int he wild. For those, simply turn on the code for the pokemon you want, load the game, then walk into a patch of grass to encounter the pokemon.