You can't.
You can't join team rocket in Pokemon diamond. Actually team rocket is not on the game
why would you want to?! if you want to know, (i think this is right) when you cross nugget bridge and get to the team rocket member, he will ask you if u want to join team rocket. Say yes.(but why would you?!)
impossible.
No
y yes u can join team rocket on red i did
A rocketchu is a Pikachu like myself who has either Joined team rocket forced to join is apart of team rocket or was a former team rocket member
You can't.
What is 0.94635 litre.
you cant
you can appear as if you have joined them at a point in the game going to the radio station in golden rod city, but you can not join them, (also the man find out you are not team rocket and battles you). so no you cannot become a member of team rocket.
you can't and also why would you?
none of them i tried its a bummer innit