You don't! There is no secret house! But there is a secret potato that you can find by pressing the lawn chair button on your controller. If that dosen't exsist on your device then boo hoo for you!
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Find the secret house in the safari zone. (side note if you continue south instead of turning west for the secret house you can find the golden teeth which the safari zone head will trade for HM4(strength))
Work your way to the back of the safari zone AKA the secret house.To get Surf in Pokemon Firered, you must make it all the way to the house at the very end of the Safari Zone in Fuchsia City. You will then receive it as a prize. On a side note, near the house at the end of the Safari Zone you can find the Warden's gold teeth and return them to him for the HM Strengh.search in the saffari zonein the safari zone go to the secret house ore something and you get itReach the end of the Safari Zone and the guy in the house will give it to you.go to the safari zone and go to the end when you find the wardens teeth go up and youll find HM SurfIn the safari zone in fuscia
To move boulders on Leafgreen you must first get the Strength HM. To get the Strength HM you have to go to the Safari Zone in Fuschia City, and go deep into the Safari Zone until you find the Secret House(you can go there to get the Surf HM) look around near the Secret House and you will find an Item called "Gold Teeth" those are the Safari Warden's lost teeth, now exit the Safari Zone then go to the Warden's House(it is one of the houses in Fuschia) talk to the Warden and he will give you the Strength HM in exchange for his missing teeth.
From the centre to the first to the second than you also find the golden theeth(you must give the theeth to Warden in the house right of the Pkmn Centre) than down and than you found the seceret house!!!!
You get it at the house on the right of the safari zone wardens house in fuchsia city.