You lose all of your pokemans
Wait for a wifi event
Yes
Yes, they can.
you have to trade over wifi or have a friend with Pokemon white and trade. you can only catch it in Pokemon white
Do wifi battles and make sure to do triple battle
Have fun do some battle subway or do wifi battles
By using WiFi or IR or in-game trades, the list goes on and on
Tap "New Game" and then save. You have started a new game and erased the old data. You will not lose your downloaded mission. Source: Experience
probably
You can not get him while playing a game. I believe there will be a wifi event in which he will be given.
you have to look around the victory road, or you can trade over wifi.
You can't get WiFi in a Pokemon game on a PC.