Pokémon Gold and Silver/Cianwood City

By now the egg may have hatched, if it has click here

Here, you probably should go to the Pharmacy and then explore, first go to the person in the house above the Pharmacy, he will give you a it is probably best to give this to day-care along with a Ditto so head there after you go to the Lighthouse. Next go to the Pokémon Center and prepare for a battle, now go north to see Suicune, after that Eusine appears and wants a battle. When you win go to the Lighthouse

Trainers
Mysticalman Eusine: Drowzee Level 23, 500 EXP, Haunter Level 23, 621 EXP, Electrode Level 25, 802 EXP, 2500