Instructions
Press "Start" on your Nintendo DS.
Highlight "Pkmn" from the pause menu and press the "A" button.
Select a flying Pokemon in your list. Select "Fly" from the list that appears.
Press the "Left" button on your D-pad until you reach the Johto screen. From there, select "Ecruteak City" from the list and press "A." Your flying Pokemon will fly you to Ecruteak City from Saffron City.