Hey RaZoR LeAf, how are things going?
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Nothing I can do about that I'm afraid. I have tried, but I think it's out of the control of the skins, and something only Serebii can do, if he even can. It may be one colour for the advert, regardless of the skin.
If anyone is vB versed and actually knows how to change it, let me know.
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I'm not entirely sure how Adsense works but would Crotan's suggestion here work, regarding replacing the variables? I can't see part of their post though, nor can I see Steve's post but yeah.
Otherwise, these two threads suggest that it's just managed through the actual Adsense account on Google so I guess Joe will have to look into that and if it can vary for different styles. *shrugs*
Hope this helps in some way.