First you need to catch at least 10 different pokemon (if you catch 1 and evolve it, this will count as 2). Next you need to use cut after Diglett's cave. On route 2, there is a small house with one of Prof. Oak's aides inside. Talk to him, and he'll give you HM with flash in it. Teach this to a pokemon and you'll be able to use flash.
The place where it flashes is where you can find the Pokemon It would flash blue if it was found in the water
Only the electric types. Like Abra and the ters its good for
Get a Pokemon that can learn flash and put them in your team , teach them flash and go through following the ladders like Mt Moon
Get Flash from a guy a route 2 Get Flash from a guy on route 2
Flash, I believe.
At flashy flash flash city
The place where it flashes is where you can find the Pokemon It would flash blue if it was found in the water
Paris can learn cut and flash
Fly and Flash.
bring the pokemon to critical health
When you hit level 12 in League of Legends
Only the electric types. Like Abra and the ters its good for
Get a Pokemon that can learn flash and put them in your team , teach them flash and go through following the ladders like Mt Moon
Get Flash from a guy a route 2 Get Flash from a guy on route 2
Yes you can't get the HM until you get to vermilion city however if you trade with a friend and that friend gives you a Pokemon that knows flash then you can have flash by the time you reach cerulean city.
Flash, I believe.
Almost any electricity or fire pokemon, otherwise pretty much only the occasional weaker pokemon. I believe Ratata MIGHT be able to. If you are looking for it for Rock Tunnel there is a guide on IGN.com for how to get through without Flash.