We have a PalmIIIxe. While we can't run Sidekick on the Palm, we can sync the data, but it requires a rather unique approach.
First, back up your User files from Sidekick.
Uninstall Sidekick.
Install the Palm hot sync software.
Reinstall Sidekick. During the install process, Sidekick will detect the Palm setup and ask if you want to install Palm support. Answer yes.
Once the Sidekicj installation process is completed, move your User files to the new Sidekick installation.
You should now be able to sync the Sidekick data to the Palm.
One note.. Sidekick allows some things that the Palm does not, like multiple day events. These will show up as error messages during the sync process.
Also.. As far as I know, only the Palm III and some of the earlier Palms are supported.
Again, we have a PalmIIIxe and SK99.