You need to go through digletts cave but to do that you need to move snorlax to do that help the power plant by giving them the missing machine part which is in the cerulean city gym go into the kanto radio tower in lavendar town and talk to the director he will give you a expn card this will let you listen to kanto radio tune into the radio and find the pokeflute channel play it next to snorlax then beat it or capture it now you can go through digletts cave when you exit the cave go north to reach pewter city.
You can't because you can only catch Oddish on Pokemon red version. the only way you can have Bellsprout on Pokemon red is trade from blue
in the forest to pewter city its rare
Do the Pokemon league then go into the cave near pewter city. It's in the somewhere...
On the right side.
From Viridian City you are going to travel north and enter the Viridian Forest. Once you get to the other side of the forest, you continue to travel north and you will enter Pewter City.
He's in Viridan city. He gives you a Teachy TV.
Pewter.
you cant get to goldenrod city in Pokemon fire red its impossible
celadon city
Fushia city
It should be in Saffron City.
If you are speaking of the Old Amber used to revive the Pokemon Aerodactyl, then you will find it in the back of the Pewter City Museum of Science. You need the HM for Cut in order to gain access to obtain it. This is true with Red, Blue, and Yellow. Good Luck catching those 150.