Use the Poké Flute to wake it up, and then you have to battle it. The sleeping Pokemon is Snorlax, and there are only two in the game, so it is best if you capture it. The Poke Flute can be obtained from Mr. Fuji, a kind old man who lives in Lavender Town. To meet Mr Fuji and obtain the Poke Flute from him, you must climb to the top of Pokemon Tower (in Lavender Town) and thwart Team Rocket. When you are back in his house, he thanks you and hands over the flute.
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In Pokemon Blue, the sleeping Pokemon blocking your path is likely Snorlax. To wake up Snorlax, you need to obtain the Poke Flute. The Poke Flute can be found in the Pokemon Tower in Lavender Town after you have rescued Mr. Fuji. Once you have the Poke Flute, you can use it to wake up Snorlax and continue on your journey.
Get the flute
you use a blue flute to wake it up.after its awake you battle it.
He is the sleeping pokemon blocking the entrance to cycling road and past vermillion city
select it in your bag and use it on a sleeping pokemon. It can only be used once.
Go to the Silph Co. in celadon and get the sliph scope.