As you embark on your journey in Pokémon Colosseum, keep these beginner tips in mind to ensure a smoother experience. Prioritize snagging Pokémon that complement your starter and cover its weaknesses. Don't be afraid to use items like Potions and Antidotes liberally in the early game; they are there to help you overcome tough battles. Pay close attention to the dialogue from NPCs, as they often provide valuable hints about upcoming challenges or mechanics.
Always ensure your Pokémon are healed before engaging in major battles, especially boss fights against Cipher leaders. The purification process is crucial; actively work on filling the Heart Gauges of your Shadow Pokémon by battling with them and keeping them in your active party. Experiment with different move combinations and consider the synergy between your two Pokémon in Double Battles. Finally, don't neglect the importance of saving your game regularly to avoid losing progress.