First, you have to talk to a Team Galactic person in Pastoria City. Next, you start to chase him around. After chasing him once, you'll have to battle your rival. Then the Team Galactic guy will give up and will battle you. Then, you will find Cynthia. She'll give you a Secret Potion for the Psyducks. Give it to them and then they'll get out headaches and will start to move away.
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Complete the pokedex.
you get the National Dex.
You have to visit the battle tower thingy first, then they let you past
complete the sinnoh dex.hope this helps:)
You Have To Do A Lot Things And Beat Gym Leaders And At Some Point Cynthia Gives U Stardust And Asked U To Give Her Grandma A Necklace In Celestic Town U Use The Stardust On The Psyduck