The world of Pokémon is constantly growing. What started out as 151 has grown by leaps and bounds, adding a slew of colorful characters with each subsequent release. We've been on some amazing adventures over the years and conquered some truly vibrant regions. For the most part, Pokémon is a wholesome and happy experience.

That said, there is a darker side to the Pokémon universe. We've seen plenty of creepy fan theories and discussions about elaborate Pokémon wars. Underneath the smili🍃ng facade is a spooktacular world, filled to the brim with horrifying things, alarming legends, and visually terrifying creatures.

Some Pokémon are more unsettling than others. In fact, a lot of these Pocket Monsters have rather morbid and mysterious Pokédex entries. This le🌱d us to compile a list that points out some of the creepiest creatures to ever grace the series. Some of these Pokémon thirst for blood, while others feast on dreams. Whether it's visual horror🐎, mental torture, or an overall eerie feeling, these creatures are potential nightmare fuel.

Did your favorite Pokémon make the list? Which one scares you the most⛎? Let u𒅌s know!

15 Parasect

At first glance, something seems a bit off about Parasect. It could be the fact that this crab-stuffed mushroom is a three-foot tall insectoid. That's enough to make anyone's skin c🦩rawl, but for us, Parasect's real fear factor lies in those haunting white eyes. There is something so demonic about those soulless orbs.

A quick skim through t⭕he Pokédex explains why Parasect goes from adorable little bug (Paras) to alien-like monstrosity. This is where things get even creepier. According to Pokémon lore, when evolving, the fungus on Paras' head grows so large that it takes control of the evolved form. Those blank white eyes represent a zombified state. The mushrooms do all the thinking for Parasecღt, using it as their insectoid host.

14 Yamask

Full disclosure, this is one of the creepiest Pokémon to ever grace the Pocket Monster universe. We have no idea what developers were thinking when they placed this morbid creature into a children's game. Yamask looks strange on its own, but we wouldn't classify it as vis🐠ually horrifying. It has an almost Egyptian aesthetic, with a stylized eye and it carries around a golden colored mask.

Like Parasect, the Pokédex sheds light on the true origins of this seemingly innocent Pokémon. Apparently, Yamask was once a human. We know, that cl🦄aim has been made many times before with a variety of different Pokémon, but with Yamask, it's 100 percent canon. According to the Pokédex, the mask it carries is the face it had when it was a human being. Sometimes it even looks to the mask and weeps. That's right, every time you catch a Yamask, you're actively enslaving a human soul.

13 Hypno

This one is a bit self-explanatory in a sense. Hypno looks rather human in design: in fact, it has five fingers on each hand (including thumbs). Its feet are beastly, sporting only three large toes on each foot and it's covered in a dense yellow fur. Hypno is visually unsettling, especially so when you notice its 5-foot 3-inch height. It always carries a mysterious pendulum with it, which it use🌳s to place its prey into a deep sleep.

Hypno primarily feasts on dreams, which is creepy enough in its own right. However, according to a Pokédex entry in Pokémon X, this hypnosis Pokémon will occasionally kidnap its victims. The journal entry is alarming, stating that there was an "incident in which it took away a child it hypnotized." Another Pokédex entry, from Pokémon Moon, suggests that🔥 the creature ওcarries off anyone who's having a good dream.

12 ✱ Victreebel

This large bell-shaped plant Pokémon was modeled after the Pitcher Plant, which lures unsuspecting prey and then traps them in a sticky liquid. Victreebel's appearance is🐭 a bit exaggerated, with two large fangs poking from its mouth and a gaping maw which lay hidden beneath a leafy protrusion. This makes it the ultimate foe for any unsuspecting bug Pokémon.

The truth is, you should always be on the lookout for this frightening flora, no matter who (or what) you are. According to lore, Victreebel lures prey with a sickeningly sweet honey aroma and then proceeds to swallo🅺w them whole. Once inside its stomach, the prey will succumb to a strong acid, which is capable of melting even the hardest material. Yes, that includes bones, and Victreebel has been known to eat a large animal or two. Heck, with its imposing height (5'07''), you could even fit a human in there.

11 Gengar

This list wouldn't be complete without a visit from the classic creeper himself. The original 151 contained a few visually unsettling Pokémon, but Gengar and his creepy smile are etched into the brains of all Pokémon fans. Gengar may not be as outwardly horrifying as some of the creatures on this list,𒊎 but his Pokédex entries and wicked smile are enough to spook any would-be trainer.

Have you ever walked into a room and suddenly felt a cold chill rise up your spine? If so, you were most likely in the presence of a Gengar. These devious creatures, which stand at a fairly large 4-feet 11-inches, love to scare humans (and other Pokémon) by hiding in their shadows. The Pokédex entry in Pokémon Sun really ups Gengar's♋ creepy factor by letting trainers know that if they do happen across this creepy creature to simply "give up" as ther𒉰e is no escape.

10 Yveltal

There aren't a lot of exceptionally scary Legendary Pokémon. This is most likely due to the fact that developers want their Legendaries to ooze badassery, rather than make people wet themselves. Still, there is on supreme creature that is pretty darn terrifying. Sure, Yveltal doesn't look like a nightmarish abomination. In fact, it looks downright cuddly with weird giant tail-arm𝔍-hand-thing.

Yveltal finds a spot on list because of its power and capability. The Dark-Flying type is nicknamed the Destruction Pokémon for rather concerning reason. When Yveltal reaches the end of its lifespan, it absorbs all of the life energy around it before balling up into a cocoon to sleep for 1000 years. This massive being is apocalyptic, self-preserving, and everlasting. The constant threat of sudden "absorpti♌on" is enough to put anyone on edge.

9 ❀ Cofagrigus

Earlier in this list we talked about Yamask and how horrible it is to realize that Pokémon Trainers are using and enslaving human souls. If you're smart, you'll stay far away from this depressed ghosts, because they might come back for revenge once they hit level 34. When a 🙈Yamask hits that magical milestone, it evolves into Cofagrigus, an eerie-looking Pokémon with a much more sinister ability.

You won't🔯 find a Cofagrigus staring at its mask in sadness, as it proudly displays it upon its coffin-like body. Four shadowy arms protrude from the ornate casket, waiting to grab anyone foolish enough to venture too c🧔lose. Victims who end up in this Pokémon's grasp are stuffed into its body, drained of their life, and turned into mummies.

8 Mawile

Mawile should be classified as the Mullet Pokémon. It's all business in the front and party in the back. Except, in this instance, "business" is a deceivingly cute Pokémon and "party" is being torn to shreds by a series of sharp fangs. Mawile is pretty darn creepy. It's got an adorable little face and ❀cute little arms, so long as you're♋ standing in front of it. On the back of Mawile's little cranium lies a carnivorous maw, filled with tons of teeth and an insatiable appetite.

What makes this little Pokémon even creepier is that it's most likely modeled after a prominent Japanese myth called Futakishi-Ona. The fable centers around a seemingly nor🐲mal woman that doesn't seem to eat much. It's later discovered that she has a horrifying mouth in the back of her head.

7 Jynx

I'm not sure we really need to explain why Jynx is on this list. This Psychic-Ice Pokémon has been unsettling tr🐻ainers ever since her (Jynx are 100 percent female) introduction as part of the original 151. Past the fact that some think her appearance is racially insensitive, Jynx suffers from the fact that she simply looks creepy.

There are many Pokémon scattered thဣroughout the universe that look human, but this dress-wearing damsel sports five fingers and a humanoid shape. Her face is rather eerie, sporting a blank stare and large lips that provide the bulk of her emotion. For the most part, Pokémon lore treats Jynx as if ꦕshe's an innocent creature with an infectious dance routine. Still, being a Psychic Pokémon, she could inflict mental torture on her victims.

6 Porygon

Bear with me here because I know this pick will be met with scrutiny, but Porygon definitely belongs on this list. I know, there is nothing even slightly scary about geometrical shapes (unless you're bad at math) and Porygon looks like an a♔dorable little low-poly dog. It earns its spot on this lisꦓt is due to the completely real and extremely terrifying seizure epidemic that spread across Japan.

Over 700 children had a terrible fright when an episode (Electric Soldier Porygon) of the Pokémon anime sent them into a seizing fit. Apparently, flashing blue and red lights created a per𒐪fect storm for those susceptible to photosensitive seizures. Super fans will argue that it was Pikachu that actually caused these seizures, and although they may be technically right, everyone associates the event with Porygon's debut episode.