Question

What Pokemon typing levels up the fastest?

Comments

Different Pokemon can level up differently even if they're the same type, so do you want the type with the fastest maximum growth rate, minimum growth rate, mode growth rate, midrange growth rate, median growth rate, arithmetic mean growth rate, or geometric mean growth rate? And a Pokemon that takes a lot of experience to reach level 50 might take very little additional experience to reach level 100. Which level are you asking about?

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fastest maximum growth rate

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What level range? For example, some Pokemon can reach level 50 very fast but are a lot slower to reach level 100.

Answer 1

There is no specific answer, but bug-types to level up the fastest, because according to Pokemon database: https://pokemondb.net/type/bug, bug types grow quickly. But, quite a few normal types level up fast, as well. This link might help,too: https://bulbapedia.bulbagarden.net/wiki/List_of_Pokémon_by_experience_type

Answer 2

I’d say the Bug type above all, but in terms of typing, I think it’s Bug-Poison, since Weedle evolves into Kakuna at level 7, and Kakuna itself evolves into Beedrill at level 10.

Fun Fact :- The second latest evolving Pokémon is Larvesta, and is part Bug type. It evolves into Volcarona at level 59.

Comments

Still, venipede evolves into wrhilipede at level 22, and whirlipede evolves into scolipede at level 30. They 3 are bug-poison, as well.

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Evolving fast isn't the same as leveling up fast.

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Yeah but it’s basically the same principle. If not, add your own answer.

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What principle? I don't understand.
Also Showdown!'s Pokedex currently doesn't have leveling rates, so I can't add my own answer until they add the leveling rates.

Answer 3

I think you likely didn't understand my comment and said "maximum" because it was the first word in the list. But you get what you ask for. You also never specified a level range, so this answer will be about experience at level 50.

Each evolution family is given 1 of 5 leveling rates, so 2 Pokemon with the same leveling rate and same experience will always reach the same level. The leveling rate that takes the most experience to reach level 50 is called "slow", so every type with any slow families will be tied for maximum experience at level 50.
source
These types have at least 1 Pokemon in a family with slow leveling rate.
Normal: Tauros
Fire: Growlithe
Water: Tentacool
Electric: Zapdos
Grass: Exeggcute
Ice: Lapras
Fighting: Heracross
Poison: Tentacool
Ground: Rhyhorn
Flying: Aerodactyl
Psychic: Exeggcute
Bug: Pinsir
Rock: Rhyhorn
Ghost: Giratina
Dragon: Dratini
Dark: Houndour
Steel: Skarmory
Fairy: Ralts
source
Every Pokemon in that list has the exact same leveling rate, so every type is tied for the maximum experience at level 50.