If Plasma is available, quickly fire two shots when entering to kill the Evir; it can help to crouch for the second shot. If only Wave is available, quickly fire three shots, then jump out exactly one tile away from the ledge and fire three more shots angled-down to kill the Evir. In any case, use Grapple to collect the drop from the pillar without needing to drop down.

Requires:

{
  "resetRoom": {
    "nodes": [
      2
    ]
  }
}
"canDodgeWhileShooting"
"canSuitlessMaridia"
"HiJump"
"Grapple"
{
  "or": [
    {
      "and": [
        "Plasma",
        {
          "cycleFrames": 240
        }
      ]
    },
    {
      "and": [
        "Wave",
        {
          "disableEquipment": "Ice"
        },
        "canFarmWhileShooting",
        {
          "cycleFrames": 420
        }
      ]
    }
  ]
}

Farm cycle drops: 1 Evir

Dev note: If Gravity is available, then other farm strats can be used instead.