I always loved the idea of Scooby as a predator. I think he deserves to chow on two helpless pokemon :D.

Scooby Doo belongs to hanna barbera
Pokemon belongs to game freak.
Better Than Scooby Snacks

One day while the mystery gang was out on a new investigation in a new place, Scooby decided to just lean his back against a tree and relax. His paws were resting comfortably behind his head as he dreamt of his last meal. It had been a full breakfast in Rustboro City that consisted of pancakes, eggs, bacon, hash browns, and biscuits. It had left the large dog feeling quite full but he never missed an opportunity to binge and show how much his gut could hold. That was a few hours ago. Now his belly began to rumble. He heavily frowned as he rolled a paw over his belly fur. Shaggy and the gang were going to be gone for a while and last last thing the great dane wanted was to delay a meal. He let out a heavy sigh of dissatisfaction. He would even eat a horse if one came stomping by. The thought made him imagine what it would be like to eat a live prey. He was well aware that he was a huge dog but he never gave the idea of eating a squirming animal and the feeling it would give him as it struggled inside his stomach. The idea was oddly pleasing to him, and the dog smiled to himself.
Suddenly a peculiar scent was picked up by his sensitive sense of smell. It was unique and something that he had never smelled before. But that wasn't what mattered to him. The smell was appetizing. He mentally wondered what this special scent could be as his mouth began to slobber up and his toes curled with anticipation.
“Mmmm..wrats rat?” the canine asked himself.
The dog bounced up from his seat on the grass and steadied himself back onto four legs and trotted around the area, letting his nose guide his way. After only a few short seconds his sense of smell led him to on area hidden behind several bushes. Scooby poked an eager eye slowly around the corner and observed the action from behind. On the other side were two creatures playing with each other. One was a vaporeon and the other a riolu. The were running around chasing each other. For a short second Scooby was surprised at the sight and recoiled his head back behind the bush. This was where the smell was coming from?
“Hmmm prokemron?” he said inquisitively.
He was nearly having second thoughts on chowing down on the two pokemon when his stomach made even more noise than before. He softly crutched his starving gut with two paws then smiled to himself. He was going to have a nice lunch today.
“Oh rell. Rhey'll have to do” the canine said, giggling to himself.
He slowly exposed himself from behind his hiding spot and walked towards the oblivious pokemon while wearing a large toothy grin and his tail wagging rappidly. The playing vaporeon suddenly stopped what he was doing to stare at the intruder with a worried look. The giant dog only widened his grin as the riolu still had his back to him. The water type looked like it wanted to warn the rioiu, but it was too late. The great dane was now standing proudly behind the steel type. The riolu took the hint from the other pokemon and slowly turned around. A look of fear quickly spread over the small pokemon's face as the dog displayed his full set of white teeth and rolled his large pink tongue across his muzzle.
“Rits runch time, tasty prokemron!”
Before riolu could attack or try to escape Scooby lunged a paw out and grabbed him by the neck and pushed the smaller creature onto the grass. The next thing the pokemon knew the large dog's huge rump had descended upon him. The riolu now had the full weight of the great dane resting on top of him. Above him Scooby wiggled his butt to try to get as comfortable as possible. The riolu below him was now struggling as much as he could.
“Ri..Riolu!” it called out.
Scooby had no idea what the pokemon was trying to say. And he didn't care. He had no interest in talking to his food. He returned his focus to the vaporeon shivering with fear in front of him.
“Vaporeon!” it cried out dramatically.
Scooby only smirked at it's fear. It made the water type look so much tastier. He new he would enjoy its squirms down his throat. The great dog reached a large paw down and picked up the whimpering pokemon by the tail. He slowly moved it to his snout and deeply inhaled its scent which made saliva rapidly build inside his maw. Some slobber began dripping out of his mouth and dripped onto the scared water type. Scooby laughed softly and sucked it off with his mouth while succeeding in getting some of vaporeon's fantastic taste from his smooth skin. The great dane decided the teasing was over and he would show the pokemon to its new home: the dog's digestive tract. Scooby lifted the pokemon slowly above his new gaping maw. The vapoeon watched in fear as the dog's giant tongue waited eagerly for it. In a quick motion it was dropped into scooby's drooling maw. His tongue lapped playfully under the eeveelution's belly and between its legs. The tip of his tongue ended up in front of the vaporeon's quivering face. The dogs mouth was now fully closed and he was sucking on the pokemon's entire body getting the maximum amount of flavor. When he decided playtime was over, the cruel dog let the pokemon slide down his gullet in a loud GULP! The riolu quivered under Scooby's butt with his tail twitching between his huge feet. The dog moaned in an extra dose of pleasure as the water type slowly settled in the canine's stomach. The happy predator rubbed a paw over his squirming gut as a belch was released from deep inside him.
“Brrrraaaappp! Yum! Raporeons are relicious!
The other pokemon began wiggling under him even more rapidly. The huge canine smiled and prepared his maw for the next visitor as he petted the riolu's snout with two hind toes.
“Rour turn, brue jackal!”
With more hunger still to satisfy the dog lifted the steel type to his mouth. He gaped his maw and let a slobbering tongue teasingly lol all over the pokemon's body. Riolu winced as he was assaulted by the canine's breath, which made the dog laugh. With the same plans he had with the vaporeon, scooby voraciously stuffed him into his drooling mouth. He eagerly lapped his tongue over riolu's feet sticking out of his mouth. With one digit of his front paw he shoved the rest of the pokemon inside him. He was now sucking on the aura pokemon's entire body and his mouth was overwhelmed with flavor. Overwhelmed by the delectable taste, Scooby had no choice but to use his powerful throat muscles to send the pokemon to his already bulging belly. Ecstasy overcame the dog's large body as the Riolu slowly slid down to join his friend. Overwhelmed by all the pleasant squirms, Scooby stood up on two feet and held up his fat gut with both his paws. The addition of the delectable pokemon created another powerful burp from deep inside the dog's large bipedal form.
“Urrraapppp” the dog released as he licked his lips. “Riolus are reven trastier!” He said, wagging his tail furiously.
The great dane steadied his balance as he continued his walk on just two legs. With two pokemon in his belly it was harder to maintain balance. On his way back to the tree he picked up a twig and used it to pick out any left over fur from riolu between his teeth. He found a few tasty hairs and happily gulped them down along with the twig. Scooby smiled widely as he continued walking with his digestive juices breaking down both prey. The great dane couldn't be happier, he had just discovered a new source of food.
“I'm rowing to eat rem all! Scooby dooby doo!”