Kill the Sidehoppers with Bombs or a Power Bomb, then IBJ up onto the Grapple block. Use Wave to get through.

Entrance condition:

{
  "comeInWithGMode": {
    "mode": "any",
    "morphed": true
  }
}

Requires:

"h_canArtificialMorphIBJ"
{
  "enemyDamage": {
    "enemy": "Sm. Sidehopper",
    "type": "contact",
    "hits": 1
  }
}
{
  "or": [
    {
      "enemyDamage": {
        "enemy": "Sidehopper",
        "type": "contact",
        "hits": 3
      }
    },
    "h_canArtificialMorphPowerBomb"
  ]
}

Clears obstacles: A