Question: Who made the decision to bomb pearl harbor?

Disambiguated questions and answers:
context: No context provided
question: Who made the decision to plan to bomb pearl harbor?
short_answers: Admiral Isoroku Yamamoto,  Rear Admiral Ryūnosuke Kusaka, with assistance from Captain Minoru Genda and Yamamoto's Deputy Chief of Staff, Captain Kameto Kuroshima

Japanese military leadership

context: Over the next several months, pilots were trained, equipment was adapted, and intelligence was collected. Despite these preparations, Emperor Hirohito did not approve the attack plan until November 5, after the third of four Imperial Conferences called to consider the matter. Final authorization was not given by the emperor until December 1, after a majority of Japanese leaders advised him the "Hull Note" would "destroy the fruits of the China incident, endanger Manchukuo and undermine Japanese control of Korea."
question: Who made the decision to approve the plan to bomb pearl harbor?
short_answers: Hirohito

Emperor Hirohito
wikipage: Attack on Pearl Harbor

Long answers:
knowledge: content: The attack on Pearl Harbor[nb 3][11] was a surprise military strike by the Imperial Japanese Navy Air Service upon the United States (a neutral country at the time) against the naval base at Pearl Harbor in Honolulu, Territory of Hawaii, just before 08:00, on Sunday morning, December 7, 1941. The attack led to the United States' formal entry into World War II the next day. 
wikipage: Attack on Pearl Harbor

content: Preliminary planning for an attack on Pearl Harbor to protect the move into the "Southern Resource Area" (the Japanese term for the Dutch East Indies and Southeast Asia generally) had begun very early in 1941 under the auspices of Admiral Isoroku Yamamoto, then commanding Japan's Combined Fleet.
wikipage: Attack on Pearl Harbor

content: Full-scale planning was underway by early spring 1941, primarily by Rear Admiral Ryūnosuke Kusaka, with assistance from Captain Minoru Genda and Yamamoto's Deputy Chief of Staff, Captain Kameto Kuroshima.[48] The planners studied the 1940 British air attack on the Italian fleet at Taranto intensively.[nb 8][nb 9]

Over the next several months, pilots were trained, equipment was adapted, and intelligence was collected. Despite these preparations, Emperor Hirohito did not approve the attack plan until November 5, after the third of four Imperial Conferences called to consider the matter.[51] Final authorization was not given by the emperor until December 1, after a majority of Japanese leaders advised him the "Hull Note" would "destroy the fruits of the China incident, endanger Manchukuo and undermine Japanese control of Korea"
wikipage: Attack on Pearl Harbor
long_answer: The attack on Pearl Harbor was a surprise military strike by the Imperial Japanese Navy Air Service against the United States naval base at Pearl Harbor in Honolulu, Hawaii that led to the United States' formal entry into World War II. Preliminary planning for an attack on Pearl Harbor to protect a Japanese move into Southeast Asia had begun very early in 1941, with full-scale planning already underway by the Spring of 1941. The decision to start planning the attack was made by Admiral Isoroku Yamamoto, Rear Admiral Ryūnosuke Kusaka, with assistance from Captain Minoru Genda and Yamamoto's Deputy Chief of Staff, Captain Kameto Kuroshima, all members of the Japanese military leadership, with the plan finally approved by Emperor Hirohito on November 5, 1941.