If you're walking down the road with a pocket full of Pokéballs, waiting to catch something, make sure you do your best to keep away from these extra-frightening Pokémon.

16. Zubat

There's a certain charm to Zubats, just like there's a certain charm to flies and gnats. Even in your loneliest moments, it's likely that there is a Zubat somewhere nearby. It's almost impossible to go more than ten steps in any type of cave in the world of Pokémon without coming across any of these creatures. One or two Zubats is annoying. Five or six Zubats presents a distinct possibility for danger. But 100 Zubats (which doesn't seem impossible considering how often they show up) is something worth being afraid of. If you see one Zubat, it's best to turn away before you see another – and another – and another.

How to avoid a Zubat? First off, stop going into caves. All caves, any cave, everything that could possibly be described as "cavernous" in any way is off-limits. Caves are no longer a part of your dictionary. If you absolutely have to go into a cave for any reason, just be sure to stock up on repels.

15. Weezing

What is Weezing, exactly? Most other Pokémon are based off animals that already exist, or they take the "inanimate object, but sentient" approach. However, it's not clear what Weezing is inspired by. It's implied that Weezing is the product of toxic gases hardening into some kind of spherical creature which then emits its own poisonous gas. It shouldn't be forgotten, also, that one of Weezing's signature moves is Self-Destruct. That's right, Weezing is willing to explode just to leave you in a cloud of toxic dust.

Weezing's whole existence also raises a lot of questions about life and the nature of sentience – are both of its heads truly alive? Which one is the main head? The big one, or is that too obvious? Either way, there's a lot of questions raised by Weezing's entire existence, and not many answers. If you're not a fan of toxic gases or phenomena that questions what it truly means to be sentient, stay away from Weezing.

14. Mr. Mime

Why does this Pokémon look so much like a human?  Why is this Pokémon a mister? Anything that is trying this hard to appear human is worth questioning, and Mr. Mime is settled right into the Uncanny Valley of "Is that really a bunch of dudes who cut their hair weird and decided to pretend to be a Pokémon species?" Also, according to the Pokédex, there are female Mr. Mimes. Whatever committee names Pokémon really should have a conversation about gender fluidity, it's 2016 after all.

As if Mr. Mime's appearance wasn't disconcerting enough (and he'd easily isn't too likely -- don't hang around long enough to find out what it's making.

13. Beedrill

Wasps are the worst, right? They're malicious, always seeming angry for no reason, and they have a vicious sting to them. Wasps always manage to show up at the worst times, too – be it a leisurely stroll through the forest or during a family barbeque. Wasps suck.

Now imagine wasps were 3 feet tall and its arms were giant fist-sized stingers. That's how awful running into a Beedrill would be in real life.

Beedrill is mostly harmless in its early forms, with Weedle threatening nothing but a light poke from a small stinger, and Kakuna being almost entirely immobile. However, once that Kakuna cracks open and reveals the angry, vengeful eyes of Beedrill, it's time to turn around and start running. It's poisonous, too. If the gaping holes left in you from the size of those stingers aren't enough, the poison will be. Next time you head into the forest, stock up on bug spray.

12. Muk

One of the earliest examples of Pokémon's proclivity to throw darts at a wall of objects and say "Okay, we're going to make a Pokémon that is that, but sentient!" There were probably less alarming ideas they could've tried out first, however, instead of going right to "sentient toxic sludge." It's not even entirely clear what Muk's body looks like, as it is always releasing a constant stream of toxic fluid from its body.

Its toxic body is apparently so powerful, that it kills any plants or trees that it comes in with. Muk's Pokédex Entry in Pokémon Sapphire claims that "In dirty towns where people think nothing of throwing away litter on the streets, Muk are certain to gather." So if you live in a city or an especially clean town, do your part and start throwing things away properly, even recycling! If not, it may not be long before you put your foot too close to a gutter drain and a Muk's arm reaches out to grab you.

11. Gyarados

How terrified must the first person who actually managed to evolve a Magikarp have been? They found this little orange fish whose body is almost entirely bone and scale, making it pointless to try and consume. Then this person decided he was going to train this floppy orange fish who seemed content to merely splash around, and only managed to fight other Pokémon by struggling. The Pokédex itself even states "Magikarp is a pathetic excuse for a Pokémon." Then one day, that little Magikarp suddenly turns into a 21-foot tall sea dragon.

This massive beast has great destructive properties going back centuries, as the Pokédex states that Gyarados is "known for totally destroying cities in ancient times." If you see a Gyarados on the horizon, the best thing you can do is head far, far away from water in the hopes that you could avoid its wrath.

10. Absol

Absol itself isn't that terrifying. It's some kind of dog/cat hybrid mammal that happens to have some kind of scythe-esque growth coming out of its head for whatever reason. This Dark-type Pokémon doesn't even to seem to have a very intimidating moveset either, learning mostly normal-type moves like Slash and Quick Attack as opposed to some of the more malicious dark-type moves like Crunch and Torment.

What makes Absol worth avoiding, however, is what the appearance of Absol brings with it. According to its Pokédex entry in Pokémon Alpha Sapphire, "Absol has the ability to foretell the coming of natural disasters. It lives in a harsh, rugged mountain environment. This Pokémon very rarely ventures down from the mountains." Basically, if you happened to have the misfortune of running into an Absol, it means that something horrible is going to happen to everything and everyone around you soon. Be it an earthquake, tornado, or tsunami, the Absol is a bad omen that signifies the coming of devastation.

9. Garbodor

Another entry in Pokémon's long-running "a thing, but sentient" series of Pokémon species, Garbador is just a walking pile of garbage. Not in the metaphoric way that some people are described as walking piles of garbage, no. Garbadors appear to literally be piles of garbage that have fused together.

The garbage-eating Garbadors seem to be a smelly nuisance, but they also have a fairly vicious reputation. According to its Pokédex entry in Pokémon Black, “[Garbador] clenches opponents with its left arm and finishes them off with foul-smelling poison gas belched from its mouth.”  Imagine walking around the city, minding your own business, and the next thing you know something grabs you and starts breathing toxic fumes into your face. Maybe it's best just to stay in on trash day in the Pokémon world.

8. Exploud

Enjoy your sense of hearing while you can, because it won't last long after running into an Exploud. Exploud's body is essentially a series of tubes out of which sound emits. These tubes are mostly used for communication, but in battle, Exploud can emit loud, booming sounds as weapons to damage their opponents. While this doesn't sound as terrifying as some other Pokémon that can cause fatal damage, seeing this Pokémon in the wild is almost a promise that it'll be the last thing you ever hear.

According to various Pokédex entries, “Its howls can be heard over six miles away." For references, most airplanes fly at an altitude of about 6.6 miles above the ground, which roughly places Exploud's outbursts at 140 dB. If you're close enough to an Exploud to see it and it releases noise, there's a very good chance that you won't be hearing anything else anytime soon. Exploud's bellows are so powerful that they're even said to be the cause of earthquakes. Exploud may appear to be a very underwhelming Pokémon, but that doesn't mean it can't ruin your entire life with relative ease.

7. Gengar

Of the original 150 Pokémon (or 151, depending on whether you count Mew), there's no denying that Gengar was the spookiest Pokémon around. While newer ghost Pokémon have formed more alarming habits and more vicious ways of haunting the still-living, there's no denying that Gengar is probably the one you want to run into the least. Gengar doesn't use tricks to lure in its prey, it lets you know from the get-go that he is bad news.

Gengar itself chills the air around it by about 10 degrees Fahrenheit, making its presence physically felt. Gengar hides in the shadows, casting curses on its prey. Its body blends in against the night, the only clearly visible parts of it being its blood-red eyes and its white, shining grin. None of that is as weird as the fact that this ghost has a really weird licking obsession. Ghastly, Haunter, and Gengar all have an urge to lick other Pokémon, as well as trainers, in the hopes of paralyzing them. It would be creepy if anyone went around trying to lick strangers, but the fact that these sneaky ghosts are going around licking people means that they should be avoided at all costs.