There are no cheats for zelda:phantom hourglass. It's a known fact ok.

Actually. Cheatchange. There are thousands of hacks for the legend of zelda: phantom
hourglass. Their only available with the action replay (ar). These hacks are called 'ar
codes'. With the action replay in your system, once you start your system up, you are
immediately send to this action replay screen. You select the game you want to hack, in
this case, legend of zelda: phantom hourglass, then activate the cheats you want to use in
your game play and deactivate the ones you don't want to use. You can search all sorts of
various codes for various things on the internet. Youtube is good for them. So is
neoseeker.
The codes look like several random numbers and letters aligned in several rows. The codes
would look something like this:

01234567 abcdef89
98765432 01fedcba
12324354 abdcfe00
0008 000

Codes may be shorter or longer depending on what the hack does. Usually, the better the
hack is, the longer the code is. You can type the code in to your system, but this can be
a real pain for really long codes. Some codes can have hundreds of rows of random numbers
and letters. And if you get a single number/letter wrong, your code will not work when you
try to use it. So for the longer codes, i highly recommend connecting your action replay
to your computer by using the usb cord that should have came with the package. Then
install the ar software to your computer. Now you can open the ar menu after all the
installation is complete and you can see and arrange all your codes and games from your
computer. The best thing about having ar on your computer is that you don't have to type
any codes. You can just copy the code for the hack you want for your game and paste it in
the new code section of your ar software under the game the hack is used in. Then you can
unplug you ar from your computer and put it in your system. Now you can use that hack in
your game! This way is much quicker and will not make any mistakes!
Some of the best cheats you can use in phantom hourglass are:

Infinite health
81 of all ship parts
81 of all treasures
Infinite rupees
Invisible link
Ghost link
Moon jump
Walk through walls
Faster speed

And many more! If you don't already have an action replay (ar), you can get one from most
places that sell lots of games like gamestop or gametrader. Each will cost you around $20.
You can also get them online.
Caution: ensure you buy the action replay for the system you want to hack!!! I lost my
first ds because i used the action replay dsi on my ds lite and my system was messed up so
badly i couldn't even turn it on anymore!!! For example, if you want to hack games on your
ds lite, make sure you only use the action replay ds. Not the action replay dsi. There is
an action replay ds, action replay dsi, and an action replay wii. I think there may also
be an action replay 3ds out now, but i'm not sure. For the wii, there is also a hacking
system that works just like the action replay does. It's a normal channel. It's called the
homebrew channel. You can google it. I'm not sure if it's free or not because i don't use
it.
I hope this helps! :d

~gaming prodigy~