One word substitute for someone who remembers his/her friend only when he/she is in trouble and ignores them rest of the time.
closed as off-topic by Chenmunka, Hot Licks, John Clifford, jimm101, user66974 Mar 30 '16 at 13:12
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The common term for this is "fair weather friend." However, I don't know of a ONE word equivalent offhand.
Such a person could be called a parasite, but there's probably a better term.
The word you're looking for is Opportunist.
a person who adapts his actions, responses, etc, to take advantage of opportunities, circumstances, etc