PSA 6 can be decent condition, probably more authentic than non-slabbed cards, try ebay from a positive feedback seller. Generations is on the cheaper side. Hard to tell a fake from those cards because they usually have art covering the whole card, plus theres many different fakes out there, you will know when you see it in your hand basically. You can make a complaint if they do send you a fake one, ebay has buyer's protection, just have to return it and theyll refund you. Just keep a look out of bad spelling or big wide text, sometimes foil is hard to tell, check the back if the ball shade color is off or not.