The elevator can be raised by clipping a shot into the floor, shot while falling with the right amount of vertical speed. This can be done with a Missile, Super, or charged Spazer or Plasma shot, a well positioned angle Spazer shot while crouched, or an or Ice SBA.

Requires:

{
  "notable": "Shot Clip to Ride the Elevator"
}
{
  "or": [
    {
      "ammo": {
        "type": "Missile",
        "count": 1
      }
    },
    {
      "ammo": {
        "type": "Super",
        "count": 1
      }
    },
    "Spazer",
    {
      "and": [
        "Charge",
        "Plasma"
      ]
    },
    {
      "and": [
        "Charge",
        "Ice",
        "canSpecialBeamAttack",
        {
          "ammo": {
            "type": "PowerBomb",
            "count": 1
          }
        }
      ]
    }
  ]
}

Clears obstacles: B