Given Nemona was brought up, isn't this literally what her goal as your rival is? She brings up training a new team specifically to pace herself alongside you until you become a Champion that she can challenge on equal terms.
I think as far as that question goes, the idea is that if you only want to fight Strong Trainers, you look like early DP Paul saying "you're worthless and not worth my time" to people like Ash, while only challenging Weak Trainers makes you look like a coward who wants to win more than self-improve.
I think this is particularly contentious with Megas and Evolutions because they serve as progress/a cap for the Pokemon in at least that original incarnation, compared to split evolutions like Gallade or Regional forms being variations that co-exist with them. So while I disagree with several cases, I get why someone would dislike something like a Mega Audino or Bisharp evolving to Kingambit because it suggests that many general buffs/QoL improvements like Signature moves, stat tweaks, etc. will be focused on that form instead of the one they prefer to play as, which you could kind of see with something like Blastoise only getting the much-appreciated Shell Smash after its Mega form got Dexited (since Mega Launcher would make its Coverage way stronger as a Sweeper like that).
Dudunsparce I want to note feels like a case of a joke most people get, but your reception depends on how funny you found it. Dunsparce has always felt like a mon where the joke is, good or not, it's deliberately boring and simple, so the Evolution being extremely basic feels like a progression of that. The thing there is that the joke is based on how the franchise regards or acts with Dunsparce moreso than being directly apparent in its design for a simple evo like, say, Tandemaus/Maushold.
