1. Get POKESAVE for Platinum
2. Back up and open your “.SAV” file
3. Edit <Events> and click <Mystery Gift Edit>
4. Inside <Mystery Gift Edit> select <Azure Flute> for <Gift Type>
5. Close <Mystery Gift Edit> and <Events> and save to your “.SAV” file
6. Open your game and receive <Azure Flute> one of <Gift Shop> in your game
7. Prepare <Master Ball> or 2 pokemons which has “False Swipe” and “Sleep Powder”
8. Go to <Spear Pillar> then <Azure Flute> will sound
9. Use <Azure Flute> then <Extended Stair> will appear and you will meet ARCEUS on top of stair
10. Use <Master Ball> for easy way or fight using pokemons with “Sleep Powder” and “False Swipe” until ARCEUS’s HP become 1 and status become “SLEEP” and use various poke ball to get ARCEUS for tough way
11. If you beat ARCEUS, go back <Mt. Coronet> and re-enter to <Spear Pillar> and repeat step 9 and 10