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How to fight online in Pokemon Diamond?

I wonder how I can play online battles in Pokemon Diamond. This is something to do with friend codes. However, I do not understand how it works. Also, as a bonus question, can anyone explain to me electric vehicles. I know it's as statistics added in sp attk and speed, but do not understand how to win. Is it to defeat a Pokemon or do you have to level up after beat that Pokémon to get additional statistics. Thanks

Question 1: To play online in Pokemon Diamond, you have to go at the Center Pokemon and use the escalator down, and get something called the Table of Pal … Go into that and say, "Your Name" and Friend Code tell you to connect to Nintendo Wi-Fi connection you need a wireless router, and connect to your local router. Then when you get your friend code and can be share with people, but also need other people's friend code, as both of you are registered, go down into the pokemon center and go into the cubicle and talk half with the woman there and then, if you and your friend is "signed for wifi" to be seen and can fight Question 2: EV train your Pokemon is necessary to an element that helps the fastest level statistics, the elements are the weight power HP Attack Power Belt Power Bracer Defense Special Attack Power Special Defense lens speed power power band ankle the rest is very confusing and I recommend you go to any of these sites pokemon impressive http://www.serebii.net http://bulbapedia.bulbagarden.net / wiki / EV_Training