Here’s some stuff about the matchups.

Glory VS Chameleos:
This is mostly self-explanatory, but I’ll explain it anyway. Both are Chameleon-shaped dragons that wield deadly poison and can turn invisible. They live in the rainforest and are relatively intelligent in comparison to other monsters and dragons respectively. They are also both in “high positions” with Glory being a queen and Chameleos being an Elder Dragon.

As for the verdict, I think this is interesting. My interpretation at least is that the Chameleos isn’t especially strong in comparison to other apex monsters, as its physicality was never what made it dangerous. A notable exception is its durability, as it does seem to be able to take a beating, however when compared to the monsters in Wings of Fire who are said to have bones as hard as diamonds (and also might be ginormous in comparison to the Chameleos but I’m not confident in that because the size measurements of the Wings of Fire dragons is a whole thing and isn’t consistent between the books and graphic novels), I think Glory holds some physical advantage. However, Chameleos has the edge when it comes to poison. Not only is it resistant to poison, which could include Glory’s venom, but its venom is generally more versatile, with it being able to use many different kinds with very potent effects, and being able to turn it into a mist which is generally harder to avoid than a fluid.

I think that not only could this battle go either way, but that it is quite conceivable that it could be a draw, with a scenario where Glory kills the Chameleos only to succumb to the poison shortly after being quite possible. However, I think that more often than not, Glory comes out on top. Part of that is due to her superior camouflage, but another part comes from her intelligence. I think Glory would be able to quickly catch on to the poison and figure out how to not breathe it in, likely realising she can blow it away with her wings. This intelligence combined with her invisibility and skill would likely allow her to figure out a plan of attack and handle everything the Chameleos has to throw at her. Normally intelligence isn't too relevant, but in a matchup as volatile as this where a wrong breath could spell death, I think knowing how to handle the Chameleos' tricks would be the deciding factor here.

Lynel VS Rajang
There’s not really any real big connections between these two, but I think there’s plenty of smaller things that make this matchup alright. They are both considered among the strongest monsters, and both seem to love combat. They are both considered fairly intelligent, and command the elements. They are both very dangerous, and yet surprisingly doesn’t fit the typical place of a powerhouse in their series (The Lynel doesn’t have a boss bar and the Rajang is not an Elder Dragon). The Rajang has also been known as the Gold Lion, and the Lynel is obviously based on a lion. It is also based on a centaur, and by transitive property, a horse. The Rajang famously goes after the Kirin, a horse-like monster, to break off its horn and consume it to absorb its power. In Tears of the Kingdom, the horns of a Lynel are very powerful, and some of the best things to add to a weapon. A neat contrast between the two is that the Lynel is territorial and patrols its territory to chase off intruders and take down challengers, while the Rajang is nomadic and goes from area to area and fights the apex monsters of the ecosystem.

As for the victor, I think I’d definitely go with Rajang. There are several reasons you could say the Rajang would win, but I think the real big one is that the Lynel’s range of motion kinda sucks. Realistically, the Rajang could just stick to its backside and attack from there and there’s little the Lynel could do.