The Global Terminal is located in Jubalife City. Once you reach there, the rest is explained in-game.
trade with friends and/or wifi trading
I'm not sure if you can wifi trading with Pokemon platinum because I have it already
you can only get it by trading a machoke with Nintendo wifi connection
You need a wifi router or a Nintendo wifi usb
Yes, unless you ask the person you are trading with, to cancel the evolution.
You have to get the member card. After the screen with Giratina on it go to the mystery gift and say receive from wifi
To unlock Mystery Gift, you have to talk to a man on the 2nd floor of Jubilife TV. Tell him 'everyone happy' as the first answer and next is 'wifi connection'.
Then no, unless you have a friend with a DS. If you are just trading with yourself or your friends this will work. If you are trying to trade with somebody you don't know then I'm afraid you are out of luck unless one of your friends has a DS with wifi.
I will
you need wifi do get it!
You have to get on the wifi event in platinum and trade it
you can't get it in platinum unless you get it from trading or migrating it