I would collect some very good cards. possivly some leval X.
On your Trainer Card.
no there is no cheat that helps you complete the trainer card.
The stars are located on the top of the card on Pokemon Ruby or Sapphire.
Pokemon's ID is your Trainer Card ID!
You get another coloured trainer card. If it's gold, you get a black Trainer Card.
The stars on your trainer card have absolutely no use whatsoever except for showing off to others. The stars also change the color of your trainer card.
yes
I dont think trainer cards do anything other than indicate how good you are, kind of like a rank in the game really
The black card is your trainer card with I think 5 stars
i think you need a e-reader to skan Pokemon cards(trainer card=trainer in back room Pokemon card=Pokemon in back room, this might work in sapphire & rube aswell).
Yes it is.
go on your trainer card