Thinking that Gon, Killua, and Bisky would be easy pickings, Binolt, an infamous bounty hunter, stalked the trio, but was quickly bested by Bisky in a flashy encounter where she didn't use any Nen. Initially, Killua and Gon wouldn't have stood a chance against Binolt on their own before they trained with Bisky; he had them beat when it came to endurance, and despite being injured, he was able to evade Gon and Killua when they attacked him at once.
While the Greed Island game is among the easiest "treasures" to acquire in the Hunter x Hunter world (it's ranked in the second lowest difficulty tier, and only because it's so expensive), not every hunter knows ever item that exists. There's really no indication that Melody has ever even heard of Greed Island. Even during the Yorknew City arc, when the auction for a copy of the game in an auction, Melody was busy doing her job as part of Killua's team.
Afterwards Melody wasn't really seen in the story until the Succession Contest arc. I haven't read it yet, but I don't think Greed Island played any part in that any more.
Well I think its because Melody went with Kurapika to finish his mission. So melody probably didn't have time to go to greed island or Melody didn't have the idea to go to greed island to heal herself with Angel's breath
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