Still doesnt qualify for Extraordinary Genius but like, as much as Clemont is an intelligent inventor (his age doesnt necessarily matter, it just shows his potential), the anime version at leats made it a huge, consistent gag in itself that his inventions have a lot of flaws and will blow up over the slightest overload. This can speak to Ash against the average trainer, but it creates a huge level of uncertainty given Clemonts track record. Clemont works on a trial and error basis rather than getting things right the first time.
Not only are you again arguing about his failed inventions, the robot was very much something that went through trial and error, he pretty much perfected it once he got the Gym back. Just because his RiceCooker5000 he made somewhere along the way blew up doesn't mean the robot he carefully worked on for weeks or months in a lab is gonna do the same. When it matters, his inventions work.
Clemont gets Genius in his general engineering and intellectual prowess, but that obv doesnt translate to his Pokemon battling (hes skilled at it as a gym leader but not to that level. You'd say he was smarter intellectually than someone like Diantha but shes a better Pokemon trainer than him in every way as the champion). Either way, this at its core says that Ash is just extremely unpredictable which doesnt necessarily mean you're super smart. We know Ash is strategic but its not something he thinks about deeply. He thinks of things on the fly and can stick to it. This doesnt translate to his Intelligence and more that he has a slight resistance to Analytical Prediction for example
Not really. The robot's task was specifically to try and comperhend his style and it failed. I never said Clemont's intellect scales to his battle prowess.
Being unpredictable and capable of thinking on his feat isn't an intelligence antifeat. Being able to think in action is also something that can qualify for Genius intelligence. He doesn't do it on instinct, he does it when he is pushed. A great example is Luffy who can think up of wild solutions to extreme situations on the fly. He gets Genius combat intellect despite the fact that normally he is an utter dunce. Being creative in a situation where its do or die is very much a measurable aspect of combat intelligence.
This is what the page says
"
Combat skill encompasses a range of factors that together describe how well a person can fight. This includes not only how effectively they use their abilities, but also whether they can apply them in ways that usually require special training or practice, as seen in martial arts. It covers aspects such as knowledge of fighting techniques, variety in combat styles, precision, experience, strategy, prediction, information processing, learning ability, and more."
He has trained unique techniques and tactics, he has figured out strategies on the spot, he has precision in figuring out the timing of his opponents tactics and can predict them (think Olympia fight), he constantly learns from battles, he has figured out peculiar and unique tactics and strategies and more. He fits.
As for the rest of your points.
1) Gifted works well for beating characters who simply have decades more experience than you, and Ash's ingenuity. You dont need to be a genius to do any of what you described. and its not like Ash cakewalked the Masters 8 (Fell for Cynthia's destiny bond, Leon had him on the ropes and was more disadvantaged in that fight for letting Ash use all 3 of his gimmicks). None of the characters you listed qualify for Genius really either, and the Cynthia Anime profile lists her as Gifted (I wrote that profile tbf but she genuinely hasnt shown Genius capability. Shes intelligent but the series never elaborates by how much). He's never outwardly portrayed as someone thats just in a league of his own either, and works very much on instinct and adaptability.
Despite falling for strategies he did manage to get out of them on the fly without prior analysis. Just because you made Cynthia a bum doesn't mean it makes her intelligence rating legit.
2) Ash varies a lot more in what region. He's a lot dumber in Unova for example (for whatever reason) than prior regions and he hasn't dont anything completely unfathomable, even someone like Fantina or Paul could copy his unique techniques such as the counter shield just by observation. While there should be separate ratings for his time in other regions, that'd need a whole CRT. Heck, Ash is the sorta character, like Goku and Naruto, that could qualify for multiple timeskip profiles
Unova is just a major outlier in basically everything. It feels like a gap because the moment he gets to XY he gets immediately way better after gym 1.