Pokémon League (Hoenn) - Bulbapedia, the community-driven Pokémon

Tyson (Hoenn) - Bulbapedia, the community-driven Pokémon encyclopedia

AG002 - Bulbapedia, the community-driven Pokémon encyclopedia

Pokémon League (Hoenn) - Bulbapedia, the community-driven Pokémon encyclopedia

Hoenn Route 110 - Bulbapedia, the community-driven Pokémon encyclopedia

A PvP Field Guide to Global Hoenn Tour

Every Pokémon Starter Evolution Trio, Ranked From Worst To Best

Pokémon League (Hoenn) - Bulbapedia, the community-driven Pokémon encyclopedia

Wallace - Bulbapedia, the community-driven Pokémon encyclopedia

AG130 - Bulbapedia, the community-driven Pokémon encyclopedia

Katie (Hoenn) - Bulbapedia, the community-driven Pokémon encyclopedia

Pokémon the Series: Ruby and Sapphire - Bulbapedia, the community-driven Pokémon encyclopedia

DP182 - Bulbapedia, the community-driven Pokémon encyclopedia

getting started

Here is a map I made with the location and info for all catchable Pokemon in Omega Ruby and Alpha Sapphire : r/pokemon