How do you get the member card in Pokemon Diamond?
You can obtain the member card in one of two ways. You can go to
an event for example at Toys R Us, or GameStop. The other way of
obtaining the member card is using an action replay and the code
for that is:
D2000000 00000000 (Hold L+R and then walk into a pokemart)
Then you go to Canalave City and go to the door of the house
right above the Pokemon Center and click (A).
There you go. Have fun with your member card and your brand new