Here's a map showing locations of all catchable Pokémon in Omega

So the pokédex in Omega Ruby and Alpha Sapphire is a gameboy

CoroCoro Magazine Shows the Pokédex and More for Pokémon Omega

ArtStation - Pokedex ORAS

Drawn Technology on X: Model sheets from Pokémon Omega Ruby/Alpha Saphire: Pokedex GBA/GBA SP Game Freak, 2014 / X

Hoenn is the worst region - The Living Pokedex: Omega Ruby - Episode 10

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Pokemon Omega Ruby Hoenn World Map Map for 3DS by MKaykitkats - GameFAQs

Soar Over Hoenn - Pokemon Omega Ruby and Alpha Sapphire Guide - IGN

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Pokémon Omega Ruby/Alpha Sapphire → Pokédex Completion → Hoenn Pokédex Seen