Ryme City, a city where Humans and Pokemon co-existed without having to do battle or were kept in Pokeballs, no masters, just equal. 
The Pokemon lived in the city, some with partners, others free. A paradise one could call it. Well, some Pokemon indeed saw it as such. 
For such a big city, it wasn't rare when a person or pokemon went missing. It was reported and either the one missing was found or was not. They at least try to find them. And while there were laws in place, some laws were broken because some Pokemon couldn't resist their instincts and.. well, predatory pokemon were still that, predatory. There were even humans that allowed their larger predatory pokemon to devour the smaller. After all, they needed and deserved to eat every once in a while. 
Most of the force knew that there was a reason why some people or pokemon are never found. It is a truth that would frighten the public so they made it their job to not reveal that some predatory pokemon indeed have been known to eat not just prey-like pokemon.. but humans as well. They have taken procautions in the past, but it wasn't uncommon. Still they search in hope they were always wrong and the person(s) were missing.. and more often then not that's the case, but also sometimes.. they'd find the remains, or the person that was nothing, and confirmation from their partner pokemon always proved that the search was painfully over.
People and Pokemon deserved food, and to deny them or put them to death for what is natural.
---
That was also many a Pokemon's feelings to as well as the Arbok's idea. The food humans made, while trying to have good intentions was just not enough for it. Also in it's own logic, why eat every day when it can eat one person and not have to eat for a couple of weeks to a whole month? It wasn't alone in it's logic. 
So that is why the cobra Pokemon sought out prey. Sure it could have any wild prey pokemon, but humans were a bit easier to consume since they couldn't suddenly attack them with a fireball or something.
It's territory was in a more secluded area of the city so if humans came than it's their own fault they were eaten. 
And speaking of dinner, it seemed to not have to wait long as a human female was walking by, seemingly getting off of work, and with a flick of it's tongue, it tasted the air. She smelled of human and a feline pokemon but there was none around..
So it didn't have to knock out the Pokemon, which was good. It slithered further out, going passed her to get ahead of her. And before she could pass It again, the cobra-like pokemon suddenly raised it's head, startling it's prey at it's sudden appearence, hood out and it preformed Glare on the poor girl that didn't stand a chance.
She was instantly Paralyzed and fell backward, barely able to move. "Wh-" The cobra was upon her without hesitating, with the girl barely able to fight, let alone move, it didn't need to use Wrap on her. And with it being so dark, no one would see what was becoming of the girl.
Jaws unhinged and it took in her feet, powerful muscles pulling her inside the snake's tight body and she could only squirm and whimper, hands weakly becoming fists and not so much as tickled it as it swallowed her down, not bothering to undress her since his powerful acid will melt anything within it's stomach.
The girl had not seen an Arbok before, and she had expected to see it under better circumstances. Her body was unable to fight the snake and her voice seemed to be affected to as she helplessly watched the cobra eat her alive.
It made it's way up her body, swallowing her hands and travelling up her arms and breasts, pinning her within. His stomach gurgled painfully with hunger that he was soon to fill up. A few more gulps and he lifted her head up, allowing her to slide down past his teeth and down his throat, with one last gulp, she was just a travelling human shaped lump that was pushed into his stomach, bulging it out. 
Letting out a hiss of satisfaction, it returned to it's more darkened home behind some old trash cans, hidden from the world so it would begin it's slow digestion.
---
(Hard Vore)
And sometimes it isn't just the wild ones that had to eat. Sometimes it's a human's own partner.
The male Liteo was brought home as a newly hatched cub by his young partner, mostly against the parents wishes, but they melted within the weeks of the Liteo playing with string and the toy mouse, tail wagging happily.
Leo was the nickname given to him along with a leather collar and lisence that they replaced when he evolved.
Evolution came just as naturally due to the love and food he recieved, but with his recent evolution, he discovered that the food currently offered wasn't as filling as when he was Liteo. 
The lion-like pokemon did what he could to eat the fish and hamburger, but it wasn't enough. When he played with his partner, he found he had to play gentler otherwise he'd hurt the poor teenager that wasn't used to his claws and new strength.
Another instinct came with the evolution, his human partner was weaker then him, but also was thinking on what to do to get him bigger portions of food. And an idea came over him, maybe, just maybe he can just eat the boy.. or some of him before he could get larger portions. To him this was a great idea, not at all knowing the outcome.
So while the parents were out and the boy was taking him out towards the large park for his usual run did he figure out his move. In his mind he would eat part of him and spit it out. He didn't think it at all through, or the fact that limbs didn't work that way.. then again how could he know anyway?
So when the leash was undone and he ran about in the park did he work himself up. And he spotted his partner sitting down, staring up into the sky.. back turned to him. It was to easy to him. His paws were nearly silent, a untamed instinct driving him, almost telling him what to do.
And when he was close enough did he charge at the prey.. eer partner, Headbutting the poor teen and knocking the air out of him.
Leo got down to business. The sudden crunch broke the silence followed by a scream that hurt his ears. Red pooled out as his teeth got around the arm, the red was salty and it was so delicious. The flesh was just as good but the red seemed to give it the right flavor like sauce and he began chewing the arm up, quickly forgetting he was meant to give the arm back, to lost in the arm as pieces were swallowed.
He nearly forgot the partner who was holding a stump where his arm was, trembling and crying as he helplessly watched his former partner eating his arm, chewing and crunching of bone added onto his nausea as he tried to get away as quickly as he could... a fatal mistake.
The Pyroar, face now red with some skin hanging from his jaws growled at the retreating prey. He had lost the idea that this was his partner and caused a lot of trauma, he only saw food trying to flee. And the prey wasn't quick enough as he chased the boy, jumped and ignored the cry of pain and shock as claws dig into the prey's back and the weight added forced him to the grass. Cries, pleas, screams, all went unnoticed as the Fire-type bit into the clothing, skin, and muscle without much trouble, tearing out bloody meat as he ate his former partner, doing his best to get to the insides under the spine, finally forcing the dying prey over onto his back, screaming weakening and becoming gurgles as the boy's throat filled with blood.
He was barely able to watch as his once sweet hearted Pokemon ate him alive, piece by gory piece. Witnessing him biting into and nose and most his face disappearing.. it was one of the last thing he see's but his last memory was of him picking up a scared and shivering lion-like cub.
Leo  ate to his heart's content, loving the bloody meat that filled him up. He had eaten his partner best he could. Once full and unable to have another bite.. not that much meat was left, he shook his head to get some of the remaining gore off his face. His prey was dead, his partner was gone, and the lion let out a roar. 
The boy's remains were found hours after the boy and his Pyroar was reported missing. It wasn't hard to connect what happened.. Leo was not seen since, but sometimes, there is a scene that proves he's still in Ryme City, hunting humans.
---
It's not just within city limits that one was to be careful of predators, of course, it was understandabally dangerous in the forests and woods. Since there were Ursarings and other Pokemon that didn't live in peace with people, of course as long as you stay away from them, they stay away from you.. right?
The summer camps were held every year, hikers came and went. Some disappeared like usual.
The Summer Camp was supposed to be a fun few weeks before school began again, and kids came and went every year.
That is what certain Pokemon learned and watched through the years what they could get away with.
It was the last night at Summer Camp, kids were always not ready to go and snuck away in the night, or were able to play Hide-And-Seek without any adult supervision. 
The Lycanroc pack had watched, tested, learned, and re-learned just how to get away with prey that was just right for them. 
Hide and seek and kids that snuck away were easiest to catch. Given how they couldn't run or call for help in time or at the distance they put themselves in.
Lycanroc surrounded those that snuck away in a tiny group and one right swipe from a a tail stunned them and they were dragged away quickly by sharp teeth, screaming til the woods were quiet and the night sounds resumed as if nothing happened.
The Midnight form was agressive but also can be just as stealthy. They would pursue prey that was hiding, and with their biped form, can grab and cover the mouth of the confused soon to be dinner. It would waste no time and usually just eat in the spot the kid had hidden themselves. Opening their maw to quickly push the human's head inside and quickly swallow so the screams that followed were muffled and didn't alert any of the other kids hiding, carefully with the help of it's clawed paws, it grips the struggling doomed prey to stop their arms from flailing. They would swallow their meal whole and alive, finding it easier and much more fun to feel their struggles to get free of the belly. They'd eat the kid up, leaving no trace behind, even sit where the current food once sat and enjoying the game play out, followed usually by the assumption the one eaten had either fallen asleep, went back to camp, or was a good hider. Lycanroc urp'd and snickered as quietly as possible.. a good hider indeed.
The Midday form hunted by ambush and usually wasn't alone in the hunt. The campers they ambushed were grabbed and dragged away deeper into the woods where they were either eaten in nearly the same way the Midnight forms do, swallowed whole and alive, only they struggle all the way into the wolf's hungry belly. Some rather unfortunate one or two would be taken back to the den to feed the pups or be practiced on for the future hunters.
The Dusk form was rare and with it's more brighter orange fur, it was a bit noticable. But also it was daring, so it waited until it was sure the camp was quiet with sleeping campers and adults. There it would pick a cabin.. always one that was not all the way shut and take careful pick of one of the campers inside. 
It was a risk that didn't get it caught yet and it always wondered if this was the night. Creeping slowly inside, careful that it's long dark claws didn't scrape along the wood floor or creak and give it away. 
Slowly it would find the one it wanted and begin it's slowly achieved meal. The lucky part of this is usually the young humans weren't as dressed as they are in the day and was better in flavor. The process was savoring and slow, jaws opening wide and taking the bare feet into the hot and wet mouth, the first swallow was the beginning and the Dusk form carefully moved up instead of pulling the prey down to much with it's swallows so not the wake it, there was a stirring that stopped it but resumed when it was sure it was still safe.. the prey would probably believe this was a dream and they were slipping into a tub of warm water or something when in reality, they were being eaten alive by a wolf-pokemon. 
The swallowing of the meal was slow but the Lycanroc worked it's way up, paws getting onto the bed as it ate the prey where it slept without making them move to much. And with a few final swallows, the meal was well earned and slumbering in the belly of the wolf who lays down on the once human bed, rubbing it's belly and letting it's tongue out, showing it's happiness of a full belly that was much larger and bulging. It would leave before dawn and, while slow with it's belly, it found it's way back to the woods and it's pack who had equally large bellies full of the nights victorious hunt. 
---
There is a place to enjoy one's self in Ryme City that makes you feel you're on a sort of farm, what with all the Miltanks around outside.
The cows graze around in the fenced field and produce delicious Moo Moo Milk for so many customers a day.
And of course, there is always some that try to steal the milk, thus the ones in charge of the Miltank taught them a way of defending themselves. 
While they are mainly herbivores, there is always once in awhile where they need some extra protein. And what a better way to deal with thieves then to let them try to take what they assume is easy, given there's no guards besides a few Growlithe that seem to be lazy and are the worst attack dogs, but of course they knew for a fact that the Miltank can handle themselves.
First moment you think your're going to get free Moo Moo Milk, next moment you're half way down a Bovine's throat who happily swallows you up whole. The experience is painfully slow and the Miltank that claims you keeps adding air to it's stomach so you can't really even run out of air and die. Sometimes you're alive for a few days and are mocked by the owners who clearly aren't going to save you
Miltank are trained to eat thieves, and while humans assume they're simple. They know who's a friend that wants to climb in and keep them company, and who wants to steal from their human companions. Plus side they produce more milk from the human meal they eat the night before, plus they are cleaning up some petty criminals in the city, so in a way it's a win win. What happens behind the fence stays behind the fence.