There are a lot of very talented people out there making absolutely stellar Pokemon fan art, but none of them can hold a candle to the next-level work being done by DeviantArtist arvalis. Seriously. Go check out his gallery IMMEDIATELY. It's insane - the care and detail that goes into each piece is mind-boggling. And he may have just finished his masterpiece: Realistic Rayquaza.
Yes, the legendary peacekeeper of Hoenn has finally been given the realistic treatment by arvalis (in GIF-form, no less!). And a few other Flying-type Pokemon have come along for the ride.
Reminder: GO CHECK OUT HIS GALLERY RIGHT NOW.