i dont know how can i get stars on my trainer card
Here are somewyas to get some stars:
1. Defeat the Elite Four
2. Beat Battle Tower at Lvl 50 (you'll be against lvl 50)
3. Beat Battle Tower at Lvl 100 (you'll be against lvl 100, be prepared!)
4. Do all contests (that's beauty, cute etc.)
5. Complete that Pokedex!
Those are the ways I know.
Hope it helped