How can I make a gradient similar to Platinum primary gradient on something like photoshop? I want it to be identical.

You could take the color from here and then try to shade it with a white background. http://forum.toribash.com/tori_colors.php

I don't know if there are some kind of templates for gradients.

For the gradient in Photoshop, you can access them by right clicking on the Bucket Tool and you should be able to see the Gradient Tool there.

The rest you can try to playing with the settings after you select the Gradient Tool(the one that under menu pulldowns).

I'm not sure about the other version but the one that I'm using is CS3, but it should me same I think. Hope this help.