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Step 1 Open up a picture where you want to add this effect to;
I used a Sith Trooper with a Diecast Metal Armor from STARWARS KotOR;

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Step 2 Select the part you want to shine, and copy it onto a new layer;

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Step 3 Create a new layer above the (in my case) shoulder-part and add THIS gradient;

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Step 4 make it look like this with the default colors BLACK and WHITE;

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Step 5 Position the gradient layer;

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Step 6 Press CTRL+G and set the blending-mode to overlay;

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Step 7 Hop onto Image-ready and press the following button;

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Step 8 Make the 1st frame have a palette like on the left, and the 2nd frame like the one on the right;

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Step 9 Press the tween-button and set these options;

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Step 10 And this is what it looks like when you've done everything correct:
