Could Bismarck have joined the coalition fleet fighting Japan?
Short answerProbably not before the decisive phase; Scharnhorst and Gneisenau were far more plausible German participants.
NotesBismarck historically commissioned in August 1940, while the decisive naval phase against Japan is expected in late 1939 or early 1940. The ship would need to finish construction, work up, travel to the Far East, and integrate with an Allied battle fleet before she could contribute. Bismarck is therefore unlikely to arrive in time. Scharnhorst and Gneisenau are much more plausible German participants and could join fast raiding groups or even meet the Japanese Kongo class. The distinction turns on operational availability rather than the commissioning date alone.