Fully overload PLMs with the item before climbing the room. The hardest part is getting past the Reo without Power Bombs, if it is stuck in the stairwell just above the door. Either manipulate it until it can escape, get it stuck swooping in the top right corner of the stairwell then kill it with Bombs, or avoid it entirely, and go up through the crumble blocks to the left after manipulating the Sidehoppers to be off-camera at the right of their pit. Avoiding the top Sidehoppers without Power Bombs can also be tricky; if starting at the top of the room, it may help to lure them to the left before going down the room. For safety, it is also possible to lure the hoppers to the left from below with several IBJs or HiJump and Spring Ball.

Requires:

"canEnterGMode"
{
  "or": [
    "Morph",
    "h_artificialMorphIBJ",
    {
      "and": [
        "HiJump",
        "h_artificialMorphSpringBall"
      ]
    },
    {
      "and": [
        "h_artificialMorphSpringBallBombJump",
        {
          "ammo": {
            "type": "PowerBomb",
            "count": 2
          }
        },
        {
          "or": [
            "h_artificialMorphPowerBomb",
            "h_artificialMorphSpringFling"
          ]
        },
        {
          "or": [
            "h_artificialMorphPowerBomb",
            "canTrickyJump"
          ]
        }
      ]
    }
  ]
}
{
  "or": [
    "Morph",
    "canInsaneJump",
    {
      "and": [
        "canTrickyDodgeEnemies",
        "h_artificialMorphSpringBall"
      ]
    },
    "h_artificialMorphPowerBomb",
    {
      "enemyDamage": {
        "enemy": "Reo",
        "type": "contact",
        "hits": 1
      }
    }
  ]
}
{
  "or": [
    "Morph",
    "canTrickyDodgeEnemies",
    "h_artificialMorphPowerBomb",
    {
      "enemyDamage": {
        "enemy": "Sm. Sidehopper",
        "type": "contact",
        "hits": 1
      }
    }
  ]
}