Final answer:
The most beneficial nursing intervention in decreasing a client's pain during ambulation in cases of acute gout is immobilizing the extremity between activities.
Step-by-step explanation:
The most beneficial nursing intervention in decreasing a client's pain during ambulation in cases of acute gout is immobilizing the extremity between activities. Immobilization helps reduce the movement of the affected joint, minimizing pain and allowing it to rest and heal. The other nursing interventions mentioned may not provide as much pain relief in this specific situation.