Get past the speed blocks and farm the Mellas. Shinecharge while running back and use a Mella to interrupt. Getting past the blocks without Morph requires either an Insane Short Charge or an Acid Shinespark.

Entrance condition:

{
  "comeInWithRMode": {}
}

Requires:

{
  "or": [
    "Morph",
    {
      "getBlueSpeed": {
        "usedTiles": 12,
        "gentleDownTiles": 6,
        "openEnd": 1
      }
    },
    {
      "and": [
        {
          "notable": "Acid Shinespark"
        },
        "Gravity",
        "canSuitlessLavaDive",
        "h_shinechargeMaxRunway",
        {
          "acidFrames": 140
        },
        {
          "shinespark": {
            "frames": 35
          }
        }
      ]
    }
  ]
}
"h_RModeCanRefillReserves"
{
  "resourceMissingAtMost": [
    {
      "type": "Missile",
      "count": 0
    }
  ]
}
{
  "partialRefill": {
    "type": "ReserveEnergy",
    "limit": 20
  }
}
{
  "canShineCharge": {
    "usedTiles": 17,
    "openEnd": 0
  }
}
{
  "autoReserveTrigger": {
    "maxReserveEnergy": 95
  }
}
"canRModeSparkInterrupt"

Clears obstacles: B