Fun fact: apparently the “Legendary Pixies” can be kinda connected to the five classic Chinese elements; Celebi is Wood, Jirachi is Metal, Manaphy is Water, Victini is Fire, and either Mew, Shaymin (more connected to ground-based plants as opposed to Celebi’s forest-theming), or Diancie (granted the stats don’t entirely line up, being literally a Carbink with +50 in both offenses, but it’s close-ish) representing Earth.
Oddly I also saw a "classical elements" thing with them, but wasn't the Chinese but the Alchemic: Victini is Fire, Manaphy is Water, Shaymin is Earth, Mew is Air, Celebi is Time, and Jirachi is Space. Now I don't think any of that is intentional and rather they represent more nebulous themes (Mew is origins, Celebi is time & nature, Jirachi is wishes, Manaphy is the sea, Shaymin is sincerity, and Victini is victory).
Anyway, I think I have a few more clones:
Pinsir, Heracross, & maybe Vikavolt: Well Pinsir & Heracross relation shouldn't be too much of a surprise as it's fairly well known their rivals & based on the Japanese "Bug Brothers" trope. They're one-stage Bug-types, share similar stats & movepools, and Hidden Ability. Beta Heracross resembled Pinsir and may have intended to be an evolution originally. So where does Vikavolt come in? Both Pinsir's and Heracross's dex entry in Sun & Moon mention they're both rivals to Vikavolt, infact Pinsir and Heracross in Alola get along with each other due to this shared rivalry. That said, aside from the beetle comparison, Vikavolt is Special Attacker and its Special Attack number (145) is higher than their Attack number (125).



Mantine & Skarmory: Doesn't look like it at first, but you can see it by looking at their stats. Same BST and numbers across their stats with Mantine being the Flying-type Special wall and Skarmory the Flying-type Physical wall. Though should be noted after Gen VII this is no longer the case as they gave Mantine an additional 20 points in HP because that's somehow will help it take double weak Electric moves better. Despite this odd decision to relate these two otherwise different Pokemon, Skarmory came out the winner with its Type combination better suiting its needs.


Arcanine & Houndoom & maybe Manectric: Now, I think this is an odd circumstance of Houndoom being a semi-clone of Houndoom and than XY seems to suggest Manectric is related to Houndoom? Houndoom, also being another Fire dog (though 55 BST points lower because it's not a Stone Evo), despite the point difference shares enough similarity with Arcanine's stats. They both have the same Speed and are offense focused, the main difference is that Arcanine slightly leans Physical and Houndoom slightly leans Special. Now, onto Manectric which has even lower BST than Houndoom. Because of the lower BST it completely gives up being all all-around attacker and instead specifically focuses on Speed & Special Attack. Yeah, not much relation though XY decided there was by giving both Mega Evos and made version exclusives (you get their Mega Stones via the same method).



Bird Trio & Beast Trio: "Um, one are birds that represent the weather and the other are cat-dog-gerbils that represent the disaster of Brass Tower". True, but that doesn't mean the beast may not have copied some notes. The Electric-type members are the fastest in each group and also have the highest Special Attack. While different Types, Aritcuno and Suicune are both defensive focused and the slowest members. Than the Fire-types are somewhat the offensive member having high numbers in both their attacking stats though Moltres leans Special and Entei leans Physical; they're also the middling speed members. They are also counterparts in someway as the Birds serve Lugia and the Beasts serve Ho-Oh.


Furret & Linoone: Not only do these two have similar body shapes but their stats might as well also be the same. Thankfully for Linoone it got a Galarian variant & evolution which breathed new life into the line. As for Furret, well he decided to go for a walcc.


Dragonite & Salamence: Both a Pseudo-Legendary, offense-focused (leaning Physical), Dragon/Flying dragons. The main difference is that one is bipedal and another is a quadruped. Well, alright, there's a bit more difference like Dragonite is a bit more defensive (higher defenses & has Multiscale) while Salamence goes straight for the throat (higher Special Attack and has Moxie).

