Pokémon is dismissed by many as just a cartoon or computer game but it also has significant cultural importance and reflects the era.
In the Pokémon of the Year poll held by The Pokémon Company, Mimikyu was voted the most popular Pokémon introduced in Sun and Moon; this also placed it 3rd overall in the competition. Kotaku's Patricia Hernandez called Mimikyu the "most brilliant and heartbreaking" Pokémon that Game Freak had created, feeling that instead of fighting Pikachu's popularity with newer designs the developers embraced it "to great effect" and represented the possible envy other Pokémon as intelligent creatures may have towards said popularity. She additionally noted Mimikyu's immense popularity with fans since it was revealed,a statement echoed by Catrina Dennis of Inverse.
In a followup article, Hernandez attributed Mimikyu's popularity to the fandom's own reaction to the "bombardment" of Pikachu in Pokémon media and merchandise, stating, "Grappling with that reality is one of the best things the Pokémon games have ever done." Edge also praised it as a "moment of self-awareness" on the part of Game Freak regarding the franchise's success, while indicating a broader change with Sun and Moon in contrast to the previous titles, "with everything shifted a few degrees away from normal."
Mimikyu was highlighted by Paste as being the "voice of a generation," highlighting its immense popularity compared to other Pokémon revealed for Pokémon Sun and Moon, such as Bewear and Popplio. They highlighted that its popularity came from the fact that Mimikyu "needs" players while the other Pokémon did not, stating that it seemed "expertly tuned to grip fans' hearts and never let go," due to the emotional vulnerability the Pokémon displayed
We know anime and gaming exist within the same cultural bubble as transactivism to a fairly large extent, so its interesting to reflect on some of this.
Mimikyu is one of the newer Pokémon having appeared in 2016. It is the only one I know that is commented on as a reflection 'of it's era'.
I think it's curious that it emerged in parallel with the certain cultural identity movements. There are cultural forces which are very much inseparable from various anime / games including Pokémon which is one of the most important.
I also note, Pokémon actually focuses on 'gender' (it says gender rather than sex) - Pokémon can be either male or female - with a few exceptions which are gender neutral and can't breed like the gendered Pokémon. However Pokémon can't change gender (some Pokémon have population where the number of male/female is very limited deliberately so you have to catch loads before you have a pair you can breed).
Also, Pikachu has lots of variants. But a couple are female only. One of these is 'cosplay pikachu'.
m.bulbapedia.bulbagarden.net/wiki/Cosplay_Pikachu
I do sometimes wonder if some of these things are deliberate or perhaps subconscious rather than being completely coincidental. Given I don't particularly believe in coincidence as being a total random force I think it's very insightful.
So don't dismiss Pokémon as a 'kids thing'. It's very much not - indeed a huge percentage of the Pokémon market, particularly merchandise is actually now pitched at and for adults rather than children. Doing so is cultural snobbery.