Vanilla ORAS was notoriously easy, especially with the Gen 6 Exp. Share that gave experience to your whole party. Update 14 hacks rebalance this:
The update expanded on existing features, providing players with more tools to enjoy their Pokémon journey. This could include additional items, clothing, or other in-game features that enrich the player's interaction with the world. pokemon+omega+ruby+update+14+high+quality