It’s the other way around. GameFreak redesigns the Pokedex each generation to resemble contemporary hardware. Gens 1 through 4 looked like the handheld you were playing on, 5 onwards look like a smartphone, and in Let’s Go only it looks like a laptop.
But it looks like the Gen 1 Pokédex to me, which did not really look like a Gameboy (I’m also pretty sure the Hoenn Pokédex did not look like a GBA until the remake)
It’s the other way around. GameFreak redesigns the Pokedex each generation to resemble contemporary hardware. Gens 1 through 4 looked like the handheld you were playing on, 5 onwards look like a smartphone, and in Let’s Go only it looks like a laptop.
But it looks like the Gen 1 Pokédex to me, which did not really look like a Gameboy (I’m also pretty sure the Hoenn Pokédex did not look like a GBA until the remake)
The precursor to the DS was the Game and Watch, back in the 1980s.
https://gameverse.com/2019/07/17/nintendo-handhelds-ranked-best-ever/
Bulbapedia has a reference of all different dex designs
https://bulbapedia.bulbagarden.net/wiki/Pokédex#Artwork
Gen 1 had a gameboy-looking face though.