If you’re looking for a challenge, use the "Similar Strength" setting for wild Pokémon so you don't run into a Level 3 Arceus immediately.
Finding a Potion might net you a Master Ball or an Evolution Stone instead.
(Optional) Pokémon can spawn with randomized movesets and abilities (e.g., a Slaking with "Huge Power"). Why Play a Randomizer?
You can play your randomized file on the Citra Emulator (PC/Android) or on a physical 3DS system running custom firmware (Luma3DS). Basic Steps to Randomize: Open the Universal Pokémon Randomizer ZX. Load your Alpha Sapphire ROM.