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

Pokemon: The Hardest Hoenn Pokemon To Catch, Ranked

Pokéarth: Hoenn

Pokedex - Pokemon Omega Ruby and Alpha Sapphire Guide - IGN

Full Sheet View - Pokemon Omega Ruby / Alpha Sapphire - 4th

Pokemon Omega Ruby and Alpha Sapphire, PkmnORAS

Pokémon Omega Ruby & Alpha Sapphire

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Pokemon Omega Ruby & Pokemon Alpha Sapphire - The Official National Pokedex

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Here's a map showing locations of all catchable Pokémon in Omega Ruby & Alpha Sapphire