Jump out 1 tile from the ledge and fire angle-down shots at the closest Evir, to quickly kill it before it descends too far. Use Grapple to collect the drop. If only Wave is used, the drop will spawn low, and in this case use Grapple while falling right of the pillar in order to reach the drop.

If Plasma is available, then killing the second Evir (instead of the first) is also an option.

Requires:

{
  "resetRoom": {
    "nodes": [
      2
    ]
  }
}
"canSuitlessMaridia"
"canPlayInSand"
"canFarmWhileShooting"
"Grapple"
{
  "or": [
    {
      "and": [
        "Plasma",
        {
          "cycleFrames": 340
        }
      ]
    },
    {
      "and": [
        "Wave",
        {
          "disableEquipment": "Ice"
        },
        "canInsaneJump",
        "canBeVeryPatient",
        {
          "cycleFrames": 680
        }
      ]
    }
  ]
}

Farm cycle drops: 1 Evir