Pokemon run the gamut in terms of their design, abilities, character traits, and of course—their weight. The heaviest Pokemon generally appear later in the series. The Pokemon Company is continually drawing more robust designs that resonate with Poke Fans and serve as intimidating contenders in battle. Although Generation 1's Pokemon aren't always the most massive, they would appear quite large in scale for the average person; especially with some of the stronger varieties near the end of the game.
As Poke-masters know, it takes experience to win battles. Stats such as Special Attack, Attack, HP, Defense, and Speed are critical. However, for those who like to outlast and overpower opponents with the heaviest Pokemon, the main series games are accommodating. As an RPG with expansive gameplay and much to do, there isn't a single path in Pokemon; and the content can be as dense as Gen I's heaviest monsters. These ground-trembling Pokemon can serve as a solid foundation to any lineup.
Updated August 31st, 2021 by Stephen LaGioia: The Pokemon brand remains a force to be reckoned with, much like the massive, heavy monsters that populate this list. Hits like Sword & Shield and Pokemon Go, along with recent efforts like Pokemon Snap on the Nintendo Switch, have kept this franchise rolling. At this point, it's been solidified as a phenom that transcends generations of kids and teens, much like Super Mario and Teenage Mutant Ninja Turtles.
Even many adults have been captivated by Pokemon, particularly when it comes to the nostalgic era of Red & Blue or the Indigo League. It is this sentimentality and unique charm of Pokemon's first generation that has given it a vast appeal and longevity among fans. Given the timeless nature of this era — and the reemergence of some of these creatures in newer games — it seemed fitting to revisit and power up this list with more of the heaviest Pokemon from gen I.
15 Graveler (231.5 lbs.)
While only the "middle child" of a trio of evolutionary Rock-Ground Pokemon, Graveler still manages to throw its weight around; all 231.5 lbs. of it. These rock creatures can be devastating for any unsuspecting prey in their path, as they live atop mountains and are virtually impossible to stop once they get rolling.
They go a step beyond their Geodude predecessors — they not only sport four arms that can curl into their bodies but they're also equipped with a handy pair of legs.
14 Rhyhorn (253.5 lbs.)
This Rock-Ground rhinoceros is a force of nature both offensively and in terms of its rock-solid defense. They can be male or female, and the males are differentiated by their longer horns, adding more to their already hefty weight.
While these creatures can be somewhat friendlier than they let on, it's advised not to approach them from behind, as doing so will startle them and often lead to grim results by way of trampling. Despite being an unevolved Pokemon, this beast can still make the ground rumble while charging with a weight of 253.5 lbs.
13 Dewgong (264.6 lbs.)
The sea lion Dewgong can be quite cold to its opponents with a slew of impactful Ice and Water attacks, often turning them into dense, helpless blocks of ice. The plump white Pokemon weighs in at a solid 264.6 lbs., which makes it all the more impressive that it can swim at a steady eight knots in highly chilly waters.
This evolved form of the cute sea creature known as Seel takes on a more majestic look with a mermaid-esque tail, billowing fins, and a horn adorning its head.
12 Exeggutor (264.6 lbs.)
Being a fairly big tree-like figure, it's perhaps no surprise that Exeggutor towers over most gen I Pokemon when it comes to its weight, clocking in at 264.6 lbs. Its Grass-type nature stems from its tree qualities, though the anthropomorphic coconuts that grow from it — which become Exeggcute when they fall — is the root of its Psychic powers.
Exeggutor has fittingly been given the reputation as the "Walking Jungle," as they roam the wilderness using their stubby legs, shaking the ground beneath them. Of course, most of its weight comes from its stout body, which is equipped to deal with the cooler climates they usually reside in.
11 Rhydon (264.6)
Given its smaller evolutionary sibling makes this list, it's no surprise that the larger, more powerful evolution of Rhyhorn claims a higher spot. This Ground-Rock monster weighs in at a robust 264.6 lbs., and can simply overpower foes with its solid defense as well as attack.
With an assortment of Normal, Rock, Fighting, and Ground moves, this horned beast can keep opponents off-balance while standing strong on its two legs — unlike Rhyhorn which must use four. Not only can it weather attacks with its thick hide, but Rhydon is even known to topple buildings with a sweeping blow of its whipping tail.
10 Mewtwo (269.0 lbs.)
This mystical Psychic-type legendary is known for its high Special Attack, but less for its weight. It's a Pokemon that's fairly tall at just over six feet. This genderless Pokemon appears as the last Pokemon and a coveted pick for fans in Pokemon Red & Blue. Lurking deep in the Cerulean Cave, Mewtwo provides the ultimate trainer test.
Have a stockpile of Ultra Balls, or be prepared to use a Master Ball, as this beast does not go without a fight. According to Mewtwo's Pokemon Yellow Pokedex entry, "Its DNA is almost the same as Mew's. However, its size and disposition are vastly different."
9 Machamp (286.6 lbs.)
Machamp is one of the rarest Pokemon in the original 150. It's a Pokemon that is only obtained by trading a Machoke as it can't be found in the wild. As a weight-lifting Pokemon, Machamp has been bulking up throughout its existence.
It's a Pokemon with a strong mastery over various martial arts. This Pokemon's weight is 286.6 lbs., with most of its weight being pure muscle and extra appendages. This is an elite brawler that can really throw its weight around in the ring or elsewhere.
8 Cloyster (292.1 lbs.)
This super-powered Ice and Water-type first appeared in Generation 1. It sports an appearance that is based on a pearl with its large protective shell. Nobody has ever seen Cloyster outside its shell, but if it did leave, it would be a much lighter Pokemon—as most of its weight comes from this large natural shield.
Cloyster has an astonishing weight of 292.1 lbs. According to Cloyter's Pokemon Yellow Pokedex entry, "For protection, it uses its harder-than-diamonds shell. It also shoots spikes from the shell," making it both an offensive and defensive force.
7 Arcanine (341.7 lbs.)
Arcanine is a mighty canine that players can depend on to win heated battles. Despite its bulky size, Arcanine can run at extreme speeds. Evolving from a Growlithe after using a Fire Stone, Arcanine become one of the generation's heaviest Pokemon.
In its puppy stage as a Growlithe, it weighs 41.8 lbs. Its weight increasing drastically after evolving. In the anime, Gary used an Arcanine to combat Team Rocket's Giovanni.
6 Dragonite (463 lbs.)
Third-stage evolutionary Pokemon are often heavier than their earlier forms. Dragonite follows suit as the heaviest Pokemon in its final stage. Starting from a Dratini with a low weight of 7.3 lbs., this Pokemon eventually grows into the 463 lb beast that is this dragon.
It's large enough to crush many of the smaller Pokemon, but not so big that it can't hug the youthful Ash Ketchum. Trainers won't see a Dragonite until level 55, but the wait is worth it for one of Generation 1's heaviest — and most powerful — Pokemon.
5 Onix (463 lbs.)
If the strength of a Pokemon had a relation to its size, Onix would be a powerhouse. On the contrary, Onix can be defeated by lesser Pokemon laced with its weaknesses like Squirtle and Bulbasaur.
Of course, this reference refers to the Onix players face in Pewter City's Gym; a typically easy fight provided Charmander isn't the starter chosen. Brock commands a high-level Onix, but many players expeditiously defeat this Pokemon. Even the Bide technique can't save Onix. As a whole, Onix is one of the more underpowered monsters of the original lineup compared to its ominous appearance—and should remain in a PC box.
4 Lapras (485.0 lbs.)
Being a particularly rare Generation 1 Pokemon, Lapras can only be found in one location. In Pokemon Red, Blue, & Yellow, Lapras is found in Silph Company Headquarters. Every player passes the person who gives you a Lapras at some point because she is next to Gary.
Lapras resembles the loch ness monster, and like this mythical monster, Lapras is a large aquatic creature that strikes an intimidating look. It was initially going to be called "Ness" until it became "Lapras." The elusive nature of this Pokemon makes its size even more peculiar, as one would think they'd be spotted far more frequently.
3 Gyarados (518.1 lbs.)
It doesn't come as a surprise that Gyarados is a powerful Pokemon, despite being one that evolved from the far less intimidating Magikarp. This Pokemon makes a fine addition to any lineup, so long as it doesn't face an Electric-type, which is quadruply effective.
With a weight of 518.1 lbs., this ornery serpentine is approximately a quarter the weight of a ton. Less than a car's weight, but more than enough to be a dominant creature in Pokemon battles.
2 Golem (661.4 lbs.)
Although Golem isn't the tallest or longest Pokemon, it is made up of densely packed plated rocks. It's been suggested that dynamite cannot scratch this reinforced beast. As a dual-type Rock and Ground, Golem is the second-heaviest Pokemon in the first generation.
According to Golem's Pokemon Yellow Pokedex entry, "Once it sheds its skin, its body turns tender and whitish. Its hide hardens when it's exposed to air."
1 Snorlax (1014.1 lbs.)
Both in mass and body fat content, Snorlax takes the cake, literally. This creature is considered the heaviest Pokémon in Generation 1 history by far, and a top contender for heaviest Pokémon of all time. You'll find Snorlax in a deep sleep annoyingly blocking routes in Pokemon Red, Blue, & Yellow.
Given its high health, the move Rest works almost as if it was designed for it. Snorlax is the definition of lazy; eating and sleeping most of the time.