Ghost Yoda is the teacher of Ghost Anakin. When teaching him, Anakin's power was very strong. This was 10 BGA - 4 BGA. In 4 BGA, Anakin was powerful enough to leave Yoda. Yoda was sitting in his seat very sad because he was teaching annoying padawans that kept pulling his ears. Then Yoda was given a message that Ricktatorship was trying to steal SirSupremacy's precious Nutmeg. This was bad so Yoda ran over to go tell SirSupremacy about the news. Yoda was running to go and tell SirSurpremacy about his precious nutmeg, until he found a giant cliff near Mount Odlid. It imploded and his walking stick broke and he fell down and died.
Ghost Anakin was devastated and used his newfound powers to make his mentor a ghost. Then Yoda came and joined Ghost Anakin's seating council.