Her relationship with her parents is exactly what made her reject the idea of ever having kids of her own.

Okay, Briar knows what her parents faults were and what her own faults are (unlike them, who didn't want to admit being in the wrong), but she can't help but feel like she will still find a way to fuck it up and would be a shitty parent even if it's not her intention.

Briar knows she is prone to starting arguments, and she would be afraid of raising a kid who's afraid of talking to her in fear of getting scolded or who knows what, just like her mother did. And she knows she's selfish and she admits it, so what if she puts her own safety first instead of her kid's, just like her dad did?

I think Briar has been told so many times in her life how similar she is to her parents (her mother would always tell her "she was just like her dad, only looking after herself" when Briar tried to defend herself; and her father would tell her "she was just like her mother, always finding a reason to fight") that she's afraid she's the same as them.

So yeah, the fear of becoming the same parent her parents were (even if she recognizes her flaws) and doing the same mistakes is what made Briar decide to never have kids.

And another reason she has that prevents her from ever wanting a kid is knowing how her reputation would affect them. Briar was the child of two normal people (her father was a punk musician, yes, but he wasn't world-famous; and her mother was just his high school sweetheart), and yet she grew up with so much weight on her shoulders to make the family proud. Now, how would the child of the Star Supernova, the incredibly popular idol and also genius scientist who researches Legendary Pokémon, feel? She knows her kid would experience far worse pressure than she ever did, and she's not heartless, even if she tries so hard to pretend she is. She can't do that to a kid.

Niko and Wade probably would be similar to their own parents, with Niko being more open from the start to their own decisions/changes in their lives.

Rayze is the big one; if Rayze had kids he'd AGONIZE over it because like hell he'd become anything like his mother or father, for different reasons. He'd try to be there for them like his parents weren't; issue is that Rayze doesn't have a good grasp of what that means. So he'd fumble/trip and fall a lot on raising kids because he frankly has no basis of affection/sympathy that someone raised normally would. He could treat them like his Pokemon treated him, he guesses, but that isn't the same as raising a kid.

In relation to my answer to the previous question: Yes.

Despite certain... hiccups here and there (most of which were personal), Elio's childhood was pretty comfortable and filled with so much love and care from nearly everyone around him; however, due to his elder siblings raising him more than his grandfather, he would do his utmost to spend as much time with his children while preventing them from being infected with a toxic mindset just as his elder siblings (un)intentionally did to him - using both his personal experiences and keen observations on his children's lifestyle as a proper guide. While respecting boundaries when necessary, he'd also made sure that they weren't spoiled rotten by steadily instilling a sense of independence; regardless, like any other loving and responsible parent, he'll make concessions should any physical or mental problems arise, just as his Pokemon parents had done for him when he was emotionally-stunted.

Tyler does have normal family squabbles here and there, but he does genuinely love his parents as stated before. He can definitely see the changes they're making, and he's doing his best to change himself. Though he does still think his mom can be blunt and overprotective, and his dad being more passive

Currently right now, Tyler doesn't know if he could raise a kid or not, its not a No, moreso an unsure. Though canonically, he does end up raising a Son, and he's pretty much the opposite of his parents. He's a bit more handsoff, letting his son go off to do things he likes to do, and talks to him honestly like a person. He's not the best father, as work can get the better of him, but he genuinely cares for his child and his child respects him and wishes to be just like him