Highlights
The most commonly encountered dual type combination in the world of Pokemon is Normal/Flying, which can be found in a total of 27 distinct Pokemon species, primarily consisting of avian creatures.Another frequently encountered type pairing is Grass/Poison, which is possessed by 14 Pokemon, although its prevalence has decreased in the more recent generations.
Flying/Bug is a popular combination used in 14 Pokemon, but Game Freak has been using it less in recent generations, preferring more distinct bug typings. Throughout the years, Pokemon has incorporated over a hundred diverse combinations of its 18 types for its creatures. However, not all type combinations receive the same treatment. Some are rarely seen, while others make frequent appearances in every new generation, spanning from Pokemon Red and Blue to Scarlet and Violet.
Since this is all about various combinations of Pokemon types, it is important to note that Pokemon with only one type will not be included in this analysis. Throughout the series, Pure Water-type Pokemon dominate in terms of numbers, but the following information focuses exclusively on Pokemon with two types.
Normal/Flying
The combination of Normal/Flying is widely regarded as the dominant type combination in the Pokemon world. This pairing has been utilized so frequently that it stands alone as the sole dual typing to make it into the top ten list of most common typings for Pokemon. A total of 27 distinct Pokemon boast the Normal/Flying type combination, starting from the very first regional avian creature, Pidgey, and continuing all the way up to the innovative Squawkabilly in Generation 9.
For some reason, Game Freak made the decision to establish Normal/Flying as the default typing for all bird Pokemon. Surprisingly, it took until Pokemon Black and White for Tornadus to become the first ever pure Flying-type Pokemon. In the years that followed, only Rookidee and Corvisquire joined the ranks of pure Flying types, while the newly introduced regional birds maintained the traditional Normal/Flying combination.
Grass/Poison
Out of the three most commonly used type combinations, this is the only one that does not include Flying in any way. Additionally, it is not only one of the most frequently encountered type combinations, but it is also the first type combination ever recorded in the Pokedex for Bulbasaur. There are 14 distinct Pokemon that possess the Grass/Poison combination, although a glance at the list of these Pokemon reveals that Game Freak primarily favored this combination during the Pokemon Red and Blue era.
Flying/Bug
Out of the 14 available Grass/Poison Pokemon, over half of them actually came from Kanto. Furthermore, the latest additions to this type combination were Foongus and Amoonguss back in Generation 5, which means that this particular combination has been pretty much forgotten in the era of three-dimensional games. However, this isn't necessarily a negative thing, considering the fact that Grass/Poison still remains one of the top three most popular combinations of all time, even though it hasn't been featured in new additions for more than a decade. Nevertheless, the decision to use this combination for a staggering nine out of the original 151 Pokemon is quite confusing.
The combination of Flying and Bug types is one of the most frequently encountered in the Pokemon series, with a total of 14 different Pokemon claiming this dual typing. However, it appears that Game Freak has been making an effort to reduce the usage of this particular combination in more recent generations. Since the release of Pokemon X and Y, the Flying/Bug type has been absent, with Vivillon being the last Pokemon to possess this combination.
Gens 7 through 9 showcase their regional bug Pokemon, bringing a refreshing twist to the conventional bug typing format. These unique combinations add a touch of novelty, revitalizing each new generation. It would be a huge delight for fans if a Bug/Dragon Pokemon were introduced, as it would signify the series reaching closer to utilizing every type combination.
Interesting Bonus: Psychic/Fairy
The combination of Psychic and Fairy types ranks among the top 10 most frequently used type combinations in the world of Pokemon. What makes this particularly fascinating is that it only gained recognition as a popular combination in hindsight, thanks to recent developments. In Generation 6, Fairy type was introduced, leading many Pokemon such as Mr. Mime and Gardevoir to be re-categorized as Psychic/Fairy types instead of their previous pure Psychic classification. This unique combination stands out in the top 10 due to these reclassifications, as well as its prevalence in newer generations with Pokemon like Hatterene, Scream Tail, and Galaran Rapidash.