Hi,
This is a list of templates that claim themselves as made for HikaShop. Which means that they have customized the views of the frontend of HikaShop or at least added some CSS code specific to HikaShop so that the frontend of HikaShop looks better with the layout/colors of the template and in some cases, they even add effects or display features.
However, you can use HikaShop with any Joomla templates, not only the ones listed there.
There is good and bad for templates made for HikaShop. The good part is that usually the frontend of HikaShop looks better, or at least better integrated with the template style. The bad part is that it requires the template provider to keep updating the template so that when we make major changes to HikaShop's frontend, they update the customization they have in the template or it leads to errors, malfunctions, etc.
When I make a website with Joomla, I personally prefer to use a template not made for a specific extension and that doesn't have too much bells and whistles. Both leads to issues with future updates. I prefer using a simple template and then add my own CSS / customization.