Surprised that someone remembered that thread
I would say that the most viable one is a very hard topic that must be discussed in a proper manner so let's go ahead
Regirock

Regirock is a well known Rockpublican, voting for Trump while being vocal about his opinions on many political issues that are mainly leaning towards the right side of the spectrum. Even though he carries the rock type he can not use it effectively anymore due to his age and regular consumption of tobacco products
Regice

Regice is a well known activist in the Regis circles. They have been voting for mainly left leaning politicians. It's superb special defense really shows it can protect itself from many special threats, yup and it's move pool is very offensive which of course annoys Regirock, but it has bolt-beam coverage so as Lil Tecca would say "I got black, I got white, what you want?"
Registeel

Registeel takes after his father by being a centralist. Not much is known about him other than the fact that he is an active user of the wonder drug "Ozempic" and the red spots on his body are just from infections he got while taking the aforementioned drug. Also he is in the midst of a horrible divorce because his wife found him using "Body Press" on something besides her, truly shocking.
Regieleki

Thanks to his high speed stat, this Gen Alpha special caused much trouble. Regieleki has been found snorting more cocaine than anyone else in the entire western hemisphere. His stash is worth around $ 500.000 on a bad day. His addiction unfortunately got the best of him so the entire family cut him out and Regigigas cut (now) Eleki out of his will, he is seen as a disgrace.
Regidrago

This guy is unfortunately not any better. He was born and raised a gangster in Chicagos well known 63rd block. He was gunned down by King Von in early 2021, he is now in a deep coma as that 200 hp stat helped him survive
Regigigas

The father of them all. He is a very powerful entity with lots of character. He will outlive all of us as he takes his sweet fucking time on any and everything. Not much to say about the guy, he's homeless nowadays (quite sad if you think about it). It's kind of weird though because he owns several estates but he chooses to be homeless. Back in the day he used to be friends with Frieza and I guess the embarrassment of Friezas death at Namek and later on by future Trunks just wore him down to the point where he doesn't want anything anymore. Quite sad, I hope he will get better.