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In terms of design
>Gen I Kanto Pokédex always looked fascinating with all of its buttons, but realistically speaking, it only ever needed as many buttons as a Game Boy since that's all it takes to navigate
>New Pokédex is a full on LCD screen and seems like it's referencing old mobile phones and one of the slimmer Game Boy models. While it solves the button problem, it doesn't look aesthetically pleasing with the overhanging top and side
>Hoenn Pokédex is confusing. Only two clear buttons that would correspond to Start and Select on a GBA, and the overhang is even more obnoxious when you realize it's meant to be held sideways. I'm guessing the Poké Ball is meant to be spun for scrolling and the button in the middle is to select
>FRLG Kanto Pokédex looks so good, but it comes at the cost of having the Dpad on the right side like the original Pokédex. While it's easy to think it's referencing the DS, it's probably more the SP since the DS was still in development and there's only one screen. But it's on the bottom, which hurts the accuracy.
>The Sinnoh Pokédex is perhaps the last truly great Pokédex, and probably the best of them all. It matches the style of the DS, has the Dpad on the correct side, and the overhang serves a purpose as a second screen. The scrolling thing on the side also looks like it slides in and out.
>HGSS New Pokédex is way too vertical and completely lacks buttons. It has a better screen than the original New Pokédex and no overhanging parts, but it loses some of the spirit in the process.
>Unova Pokédex is nifty with the sliding parts, but you can't protect both screens and there are still no buttons.
>Kalos Pokédex is godawful
>ORAS Hoenn Pokédex is nostalgic, but there's a reason the SP succeeded the GBA. Let it fold or something.
>Alola Pokédex is trash, never again
Sinnoh > FRLG > Gen I > GSC > RSE > ORAS > Gen V > HGSS > XY > Alola