>>51335798Not really, most are what the evolution is in Hisui(but you take them to other regions and become their traditional forms, or the PLA entries indicate the traditional ones exist), and Enamorus is an entirely new mon. Others are evolutions explained through items you didn't obtain. Zorua line is straight up explained as branching off the traditional.
The only ones that are strictly past forms are the Voltorb line and arguably the 2 origin ones.