its on the touch screen, near the bag and pokemon options
Click new game at the menu
No, like all other Pokemon games you can only have 1 save file.
You press 'Up' on the control pad , press 'select',and then press 'B' at the same time on the title screen to delete your save file.
You press the save button
man who is mr.fuji
No, you cannot change your ID number. It is randomly chosen for you when you create a save file in the game. You have no choice in choosing or changing it.
There's a 'Save' button on the touchscreen menu, just select that to save your game.
Save it for later
You cant, it gets nuked.
To the game card.
Transferring a pokemon to another save file is easy but will require another 3ds running the same game. you must transfer the pokemon to the other game, then switch save file then transfer the pokemon back.
you save and overwrite the file