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Ahh, I love a good Genwar.
Speaking from my own experience of having played every game since Pokemon Yellow at the age of 7, I feel like I can be a bit more objective:
RBY, GSC and RSE/FRLG are definitely harder than the games that followed them. I'm not saying they're easy, but they were at least more challenging than Gen IV onward, regardless of age.
>Discovering type advantage requires trial and error
>Higher quantity of secret areas - Power Plant and Mt. Mortar are not even integral to the plot and I didn't find them (or explore them properly in the case of Mt. Mortar) on my first run-through
>Better plot twists, surprises and level curves
>Exp. Share in RGBY required you to catch 50 Pokemon, and even then you had to find the NPC character who gives it to you yourself
>Latios/Latias are literally handed to you in ORAS
>Catch rate for legendaries as of Gen V is literal handholding - I have memories of many controller throwing moments trying to catch legendaries pre-Gen IV. Can't even remember catching Xerneas in Pokemon X
I could go on. Pokemon has objectively gotten easier over the years, there's no disputing it.