When you start at the safari zone and you go right then up eventually, you will turn left then keep going up.
the Secret House in the Safari Zone
You find the secret house in the safari zone
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))
hm suft is in the secret house at the back end of the safari zone
In the secret house in the safari zone.
The secret Pokemon house is in the safari zone in fuchsia city. I used a very useful website to get to the secret house inside of the safari zone and it told me where I had to go. Use the link at the bottom and it'll tell you exactly where to go inside the safari zone to get to the secret Pokemon House. Once you are in the secret Pokemon house you will see a guy. talk to him and he'll give you the HM03 (Surf).
all the way at the end of the safari zone. It looks like a regular house, but near it should be an item called gold teeth.
You get it in the very back of the safari zone where the fan club is
To get surf you got to get to the secret house in safari zone
Find the secret house in the safari zone.
when you find the Secret House in the Safari Zone
You receive the HM 4- Strength in Yellow by giving the Safari Warden his gold teeth back. Those can be found in the Safari Zone before the Secret House. Not sure about any other game.