I don't think that there was much written about the devil tempting Jesus in the garden at Gethsemane. I think that most of the accounts of this moment involve Jesus, the apostles, and prophets of old who comes to him in his time of need. This "agony in the garden" is when Jesus offers prayers indicating that "the spirit is willing, but the flesh is weak." There is no temptation offered here. Jesus prays to God that he wishes to have this cup "pass him by." However, he does state that if he must drink from "this cup," he will abide and do so. It is at this moment where temptation is not seen, where the battle between good and evil is not as evident. However, there is a battle between desire and duty. The poignancy of Jesus praying to his father to avoid the fate that is in front of him in terms of the cross is brought forth with ideas from the Gospel of Luke, who says that the prayers that Jesus offered were so authentic, that "his sweat was as it were great drops of blood falling down upon the ground." There is not much in way of temptation here, but rather the searching for the summoning of will to do what in one's heart know what needs to be done. I would think that if one were searching for temptation, I would focus on the time that Jesus spends out in the desert in order to test his own faith and devotion to God. In this, one sees a great deal of offerings from the devil in order to tempt Jesus.
Jesus was not tempted in the Garden of Gethsemane, He was praying to His Father to "take the cup from Him, if possible,"(quickly paraphrased) meaning He knew the suffering He was to endure, yet He asks His father, God,if there be any other way-because remember He was to be betrayed by Judas Iscariot and He announced that He was going to be betrayed by one of the twelve. However, Jesus still goes through with the cross. Back to Jesus being tempted, He was tempted in a desert, the desert of in fact, but yes He was tempted in the book of Matthew 4:1-11. The Spirit leads Him into the desert after fasting for 40 days and 40 nights and there, Satan comes to Him and tempts Him and the amazing thing is this: Satan twists or misuses(it's all about context) the scriptures and Jesus corrects Him every time. Here's the punchline-Jesus rebukes and corrects Him every time out of the book of Deuteronomy(an Old Testament book from the original Toah-the 5th book).Hope that helps you man!:)