Head to the PC turn it on and choose save.
you have to go to the PC to save the game
You cannot save a Pokemon game during a battle.
You press the save button
you have to save at a Pokemon center in your gba game and then trade over Pokemon.
Nope
it is not possible!
you wait for it to save
yes
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.
Go on the staarting menu, go on save and wait for it to save.
To the game card.
if you go to pokemonbattlearena.net it auto save the game