You need to do different tasks. Like if you beat the Elite four you get 1 star. There are five things to do to get the black trainer card with five stars 1. Beat the Elite Four 2. Fill the National Pokedex (482) Not the event Pokemon 3. Obtain a Platinum Flag underground 4. Clear the 100 battle streak at battle tower 5. Win a Master Rank contest in Hearthome
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.
5 stars
The stars are located on the top of the card on Pokemon Ruby or Sapphire.
One way is to collect Shiny Leaves, which are extremely rare.
The black card is your trainer card with I think 5 stars
you have to complete the game perfectley
star for your trainer card. (once you get all five stars, you beat the game.)
you have to beat the elite four twice
the stars are in the right hand order of your trainer card 1] beat the elite four 2]obtain platinum flag underground 3]get natinal pokedex 4]100 streek in battle frontier 5]win a master rank contest but you need to do these all in order
In order to increase the number of stars on your trainer card and, in turn, change the color of your trainer card, you must increase your value under "Score". This is done in many different ways, including defeating the Pokemon league and increasing the data in your pokedex.
there on the back of your trainer card when you get all five stars you'll be more respected and nurse joy will change too
In outer space after getting 5 (five) stars on your trainer card.