The SS Anne is in Vermilion City next to diglett cave. To get to Saffron City you need to get the tea from the old women in Celadon City, and to get to Celadon City you need to use the underground next to Lavender Town. To get to Lavender town you need to go through Rock Tunnel next to Cerulean City. Here's what to do.
1) Get off of the SS Anne and fight in the electric Gym.
2) Go through Diglett Cave and get HM Flash.
3) Teach Flash to you Abra.
4) Go back through Diglett Cave to get into Vermilion City again and get the bike coupon from the old man in the pokemon fan club.
5) Go up route 6 and into the underground tunnel to get back to Cerulean City. and use the bike coupon at the bike shop.
6) Then go across to route 9 to get to rock tunnel and use Flash in the cave to light it up.
7) when you get to the end of Rock tunnel you will be in Lavender town. Then leave to the Left to get onto route 8 and at the end there will be another underground tunnel like in Cerulean City. This will take you too Celadon City. You need to complete the Grass Gym first.
8) After the Grass Gym you need to go into the Casino in Celadon City. And go down into the basement to get the Silph Scope leave once you have it.
9) Then at the top of the city to the left of the pokemon centre there is a large building. Inside should be an old women with a cup of tea. If you take this tea to any of the guards around Saffron City they will let you in.