You have to aqquire the PokeFlute. Defeat the Team Rocket Base in Celadon City and obtain the Silph Scope. Then go back to the Pokemon Tower in Lavender Town and rescue Mr Fuji, he will give it to you, then play it next to the Snorlax.
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You need a pokeflute. You get it after you complete lavender town.
I prefer rhydon, he's much better than fat snorlax
As far as I know you can't get Snorlax in emerald without hacks. trade form fire red or leaf green.
Trade Trade from Leaf Green or Fire Red you have to trade it from fire red to sapphire to ruby to emerald!
if your talking about the snorlax thing,you don't REALLY need the red flute.Just go to your radio and bring the cruiser to the top of it and you'll see pokeflute channel do it near the sleeping snorlax,then click A,the snorlax will wake up and battle you (it is catchable).But if your talking about the battle item,"red flute" all you have to do is let your Pokemon hold it and when it falls asleep,it'll wake up in 1 or 2 turns automatically.