1. Check for Encounters:
* Walk around the gym: Sometimes the Team Rocket grunts might be hiding in a corner or behind a wall. Try walking around every area of the gym to see if they appear.
* Re-enter the gym: Try leaving the Cerulean Gym and then re-entering. This can sometimes trigger the event if it wasn't properly initiated.
2. Save and Reset:
* Save your game: Always save before trying anything drastic.
* Soft reset: Turn off the game completely and then turn it back on. This can sometimes fix minor glitches.
3. Consider a Glitch:
* Rare Glitch: It's possible you've stumbled upon a very rare glitch. If the above steps don't work, this could be the case.
If nothing else works, you might need to:
* Reload a save: If you have a recent save before entering the gym, you could reload and try again.
* Look for online help: Search online for "Pokemon Soulsilver Cerulean Gym Team Rocket Glitch" and see if others have encountered this issue. You might find a workaround or solution.
Remember, glitches can be frustrating, but they're a part of the fun (sometimes!) of playing older games. Good luck!