If Screw Attack or Plasma are available, farm the two Evirs closest to the door. With Wave or Spazer, it won't be possible to kill the second Evir in time, in which case the room can be crossed to reach a third one.

Requires:

{
  "resetRoom": {
    "nodes": [
      1
    ]
  }
}
"canPlayInSand"
"canDodgeWhileShooting"
{
  "or": [
    {
      "and": [
        "Gravity",
        "ScrewAttack",
        {
          "cycleFrames": 320
        }
      ]
    },
    {
      "and": [
        "Plasma",
        {
          "cycleFrames": 330
        },
        {
          "or": [
            "Gravity",
            {
              "and": [
                "canSuitlessMaridia",
                "HiJump",
                {
                  "cycleFrames": 50
                }
              ]
            }
          ]
        }
      ]
    },
    {
      "and": [
        {
          "or": [
            "Wave",
            "Spazer"
          ]
        },
        "canFarmWhileShooting",
        {
          "cycleFrames": 975
        },
        {
          "or": [
            "Gravity",
            {
              "and": [
                "canSuitlessMaridia",
                "HiJump",
                {
                  "cycleFrames": 90
                }
              ]
            }
          ]
        }
      ]
    }
  ]
}

Farm cycle drops: 2 Evir

Dev note: Farming a third Evir is possible but would rarely be worthwhile.