Take the ball to Kurt in Azalea Town, wait 24 hours, then place it in the Ilex Forest shrine to encounter a Level 30 Celebi. This is the only legitimate way to shiny hunt Celebi through soft-resetting.
The X button can be used as a substitute for the Start button to open the menu, though Virtual Console "Restore Points" (save states) are notably not supported for this specific title to prevent cloning glitches. Core Game Features (Crystal Enhancements) Pokemon Crystal Version 3DS (WORLD) CIA (VC-GBC)
Unlike Gold/Silver, Crystal features a expanded plot centered on the legendary Pokémon Suicune and the character Eusine , who is hunting it. Take the ball to Kurt in Azalea Town,
The 3DS version includes technical modernizations and a previously "lost" event for international players: wait 24 hours
After defeating the Elite Four and the Champion, enter the Goldenrod City Pokémon Center and then attempt to leave. An NPC will give you the GS Ball.