In Pokemon platinum who can you WiFi battle?

Answer 1

first you need to register a friend code in yo pal pad

you need a friend of your who plays Pokemon

you also need to give oyu r friend code to that person

after doing that go into a Pokemon center (any)

the go downstairs talk to the lady in the middle select the option

go to wi fi club ( or something like that) after you enter you can select the type of battle you whant or if you whant to trade

if you whant to battle i can battle ou if you whant