In my headcannon, the Mane 6 from Equestria and their human twins meet pachyderms. African bush elephants and African forest elephants from Tarzan’s land. And Asian elephants from Mowgli’s. And mammoths including the ones from Ice Age and Brother Bear, and mastodons who dwell among them. And straight tusked elephants includign Hathi and his herd (base on the 2016 version). And Deinortheriums, Gomphotheriums, Platebelodons, Moeritheriums, and Syrian elephants. The extinct ones come from Pellucidar. And also Heffalumps including Lumpy and his mama. ANd Mosbee and Dipper from Flint the Time Detectiuve. And some Mammothmon form Digimon. And pachydermoid Pokemon including Ash’s Donphan, and some mammoth theme ones I forge call Mammophants including one similar to Hathi who’s the monarch of a prehistoric world where my ideal girlfriend for Ash comes from. And Dumbo and his ma.
I picture them meeting many of the pachyderms first on Tarzna’s land. They’d also meet more on Asia. Among the Siamese ones be white ones; fitting due to their holy role on Siam.

Grand one.
Nice of the pachyderms to welcome them. They zero doubt admire them for their courage and compassion; two virtues they possess being pachyderms.
You add prehistoric ones. And some of the prehistoric ones I picture meeting the Mane ones. Including mammoths. I also had in mind American mastodons, straight-tusked elephants, and Gomphotheriums. I’;d always been onto pachyderms since I was small; my personal fave of animals. And their trumpets be my personal fave of animal noises.