Can someone add me to their pal pad in pokemon diamond/ pearl?

Question

I need to add people to my pal pad and if possible someone adds me....is it necessary that if i add someone, that person will have to add me too, so we can battle/ trade?..Also here;s my trainer id:

Name: Kaustav

Code: 4124 6852 0098

Thx.........

Answer 1

I have added you guys. Can you add me too.

Name: R.K

Code:  3652 2405 7629

Answer 2

sure i'll add you

and my FC is 2320 7709 3876

Name: Zach

and yes it is necessary so when you go to the Downstairs of the Pkmn Center you will know who the people are