How do you get to Giovanni in the Silph co in Pokemon Leafgreen

1.Go to Floor 5
2.Go to the bottom and battle the grunt
3.Pick up the item.
4. Go to floor 3
5. Go to where there is a left gate and a right gate.
6. Go into the portal in the left gate.
7. Move on NOTE: GARY BATTLE AHEAD. HEAL FIRST.
8. Defeat Gary.
9. Optional: Talk to the guy next to Gary because he gives you LV 25 Lapras.
10. Move on and battle Giovanni
Now do you know how?