As long as this card remains face-up on your side of the field, "Pandemonium" on your side of the field is not destroyed by your opponent's card effects.
Rulings
Individual Card FAQs
When your opponent activates "Huge Revolution" while your "Pandemonium Watchbear" is on your side of the field, your "Pandemonium" will not be destroyed.
When your "Pandemonium" is going to be destroyed by "Mystical Space Typhoon", you can chain "Ceasefire" to flip your "Pandemonium Watchbear" face-up, and "Pandemonium" will not be destroyed.
Netrep Rulings
If a Field Spell Card is played while "Pandemonium" is active, "Pandemonium" is destroyed, even if "Pandemonium Watchbear" is on the field.
DARK|
Level 4|[ Beast / Effect ]
ATK 1300|
DEF 1800