1. Arbok
   Sandshrew
2. Mewtwo
   Onix

Arbok is unique in many different ways. One example is that its markings can be one of six designs. Just as Ekans backwards spells "snake," Arbok backwards spells out "kobra," like the real life animal that it resembles!

1. Dugtrio
   Vileplume
2. Venusaur
   Abra

Dugtrio is a powerful group of triplets that can do some serious damage underground. You'll want to check the Richter magnitude scale when this Pokemon is around because the numbers will be off the charts.

1. Fearow
   Bulbasaur
2. Rhyhorn
   Pikachu

Pikachu is a great Pokemon that has a lot of time to shine in both the games and anime. Ash's Pikachu is a great example of how loyal and important a Pokemon can be in a trainer's life. You never know when your little buddy can help you out in a big way!

1. Diglett
   Raichu
2. Slowpoke
   Nidorina

Nidorina is evolved from the female Nidoran. The females within the Nidoran evolutionary line are all blue while the males are purple instead. This can really help when trying to identify them, if you don't have your Pokedex, of course!

1. Mankey
   Gengar
2. Bulbasaur
   Electrode

It's hard to miss Gengar's big smile and eyes. It's said that if you pass Gengar in the dark, you'll feel a shiver. Look around if you dare! Maybe you can catch yourself one of these unique and interesting Pokemon.

1. Pidgeot
   Clefairy
2. Caterpie
   Gloom

Clefairy isn't a legendary Pokemon, but they're still very hard to find. Did you know that lefairy was almost the mascot of Pokemon instead of Pikachu? It's hard to imagine any other Pokemon as the face of the franchise than Pikachu.

1. Poliwrath
   Omanyte
2. Snorlax
   Wartortle

Poliwrath is the evolution of Poliwhirl, which is similar in look. Not only is this Pokemon strong, but it is a strong swimmer as well. A battle underwater with this Pokemon would probably be in favor of whichever side has a Poliwhirl!

1. Mew
   Weepinbell
2. Hitmonchan
   Moltres

Mew closely resembles a cat, but it has the ability to fly around. Did you know that Mew was hidden in the game "Pokemon Red and Green" by its creator, Shigeki Morimoto? Somehow, the Pokemon still made it into the final game and has become an important part of it.

1. Machamp
   Fearow
2. Gloom
   Alakazam

With a name like Alakazam, it's no wonder that this Pokemon is a psychic type. Any Alakazam that you encounter has been psychic all its life, since it was once an Abra and a Kadabra. You won't find a Pokemon that's any more magical than these three!

1. Beedrill
   Pikachu
2. Nidoking
   Rattata

Just as we have real rats, they exist in the Pokemon world as well. However, they're technically known as Mouse Pokemon within the universe. Rattata was purple and resembled a regular mouse in the Kanto region, but later got a makeover for its appearance in the Alola region as well!

1. Arbok
   Ponyta
2. Poliwhirl
   Mewtwo

Mewtwo was the creation of an unfortunate attempt at cloning the legendary Pokemon, Mew. While they don't look identical, they do share some of the same features. This is one example of the dangers of cloning Pokemon.

1. Venomoth
   Haunter
2. Metapod
   Electabuzz

Metapod is the first evolution of Caterpie, later turning into Butterfree. Fans of the anime will remember the battle between Ash and Samurai where they both sent out their Metapods for the never-ending "Harden" battle.

1. Wartortle
   Dratini
2. Raichu
   Gloom

Dratini evolves into another snake-like Pokemon, Dragonair and later into Dragonite. Nearing the end of the Pokedex, these three Pokemon sit at the numbers 147, 148, 149. In the original Pokedex, the numbers go up to 151.

1. Magneton
   Vulpix
2. Onix
   Mr. Mime

There's no Pokemon like Onix! Just like the gemstone, the rocks that Onix is made of smooth out as it gets older. The Pokemon is also known for its ability to create large tunnels underneath the ground.

1. Chansey
   Gastly
2. Omanyte
   Clefairy

Though you can almost always find one in every Pokemon Center, these Pokemon are actually very rare. Don't get Chansey confused with Clefairy, they have similar names and looks, but there are a few distinct differences. Consult your Pokedex if ever in doubt!

1. Articuno
   Mewtwo
2. Persian
   Primeape

One of the three legendary birds, Articuno is an ice type. Did you know that you can't find Articuno in the original anime? The Pokemon can even be a sign if you're lost in the icy mountains, so you don't want to see one there.

1. Rapidash
   Weepinbell
2. Growlithe
   Charizard

In the anime, it was very common to see Officer Jenny alongside her loyal Growlithe. Just like our dogs in real life, Growlithe are talented when it comes to sniffing things out and know how to serve and protect.

1. Weezing
   Electabuzz
2. Jynx
   Hypno

Hypno knows a thing or two about doing just that — hypnotizing people! That's why the Pokedex advises that you should never look into the Pokemon's eyes for your own safety. Even a gaze can put you into a trance.

1. Graveler
   Nidoking
2. Magikarp
   Ivysaur

What's better than a Magikarp? A shiny Magikarp, of course! You can tell a shiny Magikarp from a regular one by the color. There was even one in the anime in the episode "Battle Aboard the St. Anne!"

1. Dewgong
   Gyarados
2. Lickitung
   Ditto

No one has better taste than Lickitung, who has a tongue as good as a dog's nose. In fact, according to the Alola Pokedex, this is not a Pokemon that you want to be licked by, unless you're fine with getting a rash afterward.

1. Primeape
   Dewgong
2. Meowth
   Mew

The Meowth that is part of Team Rocket in the anime is very interesting. He has a sad backstory where he was alone and later tried to change for a girl Meowth that he liked. This is why he learned how to walk and talk, unlike the many other Meowth that inhabit the Pokemon world.

1. Hitmonlee
   Kangaskhan
2. Dragonair
   Drowzee

Hitmonlee packs a powerful kick with its legs that can extend to great lengths. This Pokemon could win against even the most skilled human fighters, but its real test of strength comes in the form of Pokemon battles.

1. Jigglypuff
   Venonat
2. Tentacool
   Magnemite

Jigglypuff can float, but it can also flatten itself right out. This might be why it's called the balloon Pokemon! Its soothing voice is so beautiful, that it can put anyone within earshot into a deep sleep. This can be dangerous at times.

1. Snorlax
   Spearow
2. Raticate
   Charmander

If you think you get a good sleep at night, you haven't met Snorlax. In a competition, this Pokemon could give even the deepest sleepers a run for their money. Often, they block roadways while sleeping due to their size and nature.

1. Golduck
   Koffing
2. Seel
   Kabutops

Looking just like a real-life seal, this Pokemon is also known as Seel. If you'd rather catch a glimpse of one rather than catch one, Cerulean Gym has a few different Seels. It even resembles real-life seals for their thick skin in freezing temperatures.

1. Grimer
   Charizard
2. Shellder
   Exeggcute

Though it appears to be a pile of sludge, Grimer needs love, too! This Pokemon is able to keep its form, but it can also maneuver its body to fit in other places. You never know when that ability might come handy!

1. Tentacool
   Exeggutor
2. Tangela
   Staryu

Similar to a jellyfish, Tentacool is found within oceans and other water bodies in the Pokemon universe. While as humans our bodies are made of approximately 70% water, Tentacool is almost entirely water at about 99%!

1. Machoke
   Kadabra
2. Gengar
   Snorlax

Machoke is always up for some bodybuilding. It has very high self-esteem and prides itself in its ability to stay fit. They can be especially helpful when it comes to hard labor involving heavy lifting.

1. Cubone
   Sandslash
2. Kakuna
   Machamp

This dinosaur-like Pokemon has lived a tragic life with the loss of its mother. This tragedy only makes Cubone stronger, however, as it learns how to defend itself using bones. Cubone is a master with weapons.

1. Golem
   Cloyster
2. Kingler
   Dragonite

Looking just like a crab, Kingler lives by the ocean and soaks up the sun. Communication is key when it comes to Kingler as they talk with their hands — or should we say claws? Be careful when approaching these Pokemon.

1. Rapidash
   Vulpix
2. Magmar
   Venomoth

Vulpix has six tails until it is evolved into Ninetails, when it gets nine tails instead as its name suggests. You can tell how old a Vulpix is by both the number and color of the tails that it has. The more tails it has, the older it is. If the tails are white, it's still quite young.

1. Charmander
   Arcanine
2. Ponyta
   Flareon

Charmander is one of the Pokemon that you can choose to start your journey with in the Kanto region. It's more likely that you'll have a male Charmander, as the females are a little rarer. If you have a Charmander, it's very important to keep an eye on its tail. This is because it can tell you a lot about its health and well-being.

1. Beedrill
   Scyther
2. Electabuzz
   Rhydon

Remember the battle between Pikachu and Rhydon? It's one memorable battle from the anime that is noted for Pikachu, an electric type winning against Rhydon, a ground type. Any trainer can recognize how off-balance this battle was!

1. Electrode
   Parasect
2. Magneton
   Voltorb

Voltorb is just like your average Pokeball, except that it's alive. This Pokemon will make you look twice before picking up a Pokeball, since they are able to self-destruct. Keep a watchful eye out and make sure that you know the differences between them.

1. Voltorb
   Doduo
2. Dratini
   Slowbro

Slowbro is the evolution of Slowpoke, with the addition of a Shellder attached to its tail. If the Pokemon loses the Shellder, then it will also revert back to its status as a Slowpoke. However, you can always just go on a search for another Shellder!