For the Power Bomb and Screw Attack kills, this strat assumes you don't know you're entering the room beforehand. If you know, it's possible to Power Bomb kill the first two Sidehoppers damage-free by morphing before entering. For Screw, just entering with a spin jump would work.

Requires:

{
  "enemyDamage": {
    "enemy": "Sidehopper",
    "type": "contact",
    "hits": 1
  }
}
{
  "or": [
    {
      "enemyKill": {
        "enemies": [
          [
            "Sidehopper",
            "Sidehopper"
          ],
          [
            "Sidehopper"
          ]
        ],
        "explicitWeapons": [
          "Missile",
          "Super",
          "PowerBomb",
          "ScrewAttack",
          "Plasma"
        ]
      }
    }
  ]
}

Clears obstacles: C