Pokemon Soul Silver What To Do After Beating The First Gym How Do You Migrate Pokemon From Pokemon GBA Game (Emerald Firered Etc...) To Soul Silver Or Hear Gold?

How do you migrate pokemon from Pokemon GBA game (Emerald Firered etc...) to Soul Silver or Hear gold? - pokemon soul silver what to do after beating the first gym

I think the key migration into the registration screen. I know where Pal Park and the soul plays Silver (SS) and Beat Red Beat the Elite four and all the gym badges .... So Help Me ..... =^.^=