I've never used the Pokémon compendium known as the Pokédex much in the Pokémon games, but the idea of having a physical Pokédex is still really cool. Sure, you could buy a toy Pokédex, or, you can put a decal on your red 3DS to make it look like one instead!
If you think the latter option is more appealing, here's a neat find via Tiny Cartridge: an Etsy shop that sells a Pokédex decal kit for your 3DS. 15 bucks a pop.
If you have some extra money you're itching to part with, you could even get the official Pokédex app, too. It's expensive, though (and not for the 3DS.)
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Pokedex decal kit for red 3DS & 3DS XL [GameThemedThings's Etsy Shop, Via Tiny Cartridge]