Well, I'll try my best:
If you mean the Goldenrod Department Store: Head to the Goldenrod City and on the right of the Pokemon Center you'll find a Goldenrod Department Store. Head to the fifth floor. :)
If you mean the Move Tutor: I don't think there are any Move Tutors. The Move Tutors around Johto only teach you 1-3 moves, and there is one after beating Kanto. If you head to Blackthorn though, go into one of the houses and you'll find a Move Tutor that will teach you the 'Elemental Beams'. However, if you have any B.P there is one in the Battle Frontier that will teach you a variety of moves.
Hoped I helped. :)
