When a Pokemon has the move Flash, you go into Party, then select the Pokemon with Flash using the 'A' button and there should be an option that says "Flash". It is only usable in dark locations or within battle.
No that would be nice though to get more light defeat pokemon.
Go to the top of Sprout Tower in Violet City and battle the guy who your enemy guy just battled. When you beat him he will give you HM Flash.
To my knowledge i don't think there is a waterfall in Pokemon yellow and it is quite irrelevant to the storline if there was one. If you mean a HM named waterfall...i think your on the wrong game, only pearl and diamond have waterfall HM...i think. There are only 5 HM's in Pokemon Yellow Flash, Cut, Fly, Surf, Strength.
In Pokemon Platinum, Flash is a TM.
Yes. It lowers Accuracy.
Teach it to a Pokemon, then select the Pokemon you taught it to in the party and select Flash.
on Pokemon yellow on Pokemon yellow
Flash can be found on Route 2 in Pokemon Yellow Version.
in emerald hm05 is flash, you find it in granite cave but you have to have the knuckle badge to use it outside of battle
When a Pokemon has the move Flash, you go into Party, then select the Pokemon with Flash using the 'A' button and there should be an option that says "Flash". It is only usable in dark locations or within battle.
If he does not give you Flash, then you just lost the battle. He always gives out Flash.
Cut, Fly, Surf, Strength, Flash.
pikachu or electric Pokemon ......
To navigate through Rock Tunnel
Sprout Tower in Violet City, you must do battle with the Sages.
i believe so it has always been a Pokemon field move