Start the dash as close to the door transition as possible in order to store the shinespark in time. Stand 2 or 3 pixels from the door for run speed to be low enough going into the next room. Spark up and fall onto the platform left of the fish.

Entrance condition:

{
  "comeInRunning": {
    "speedBooster": true,
    "minTiles": 0.4375
  }
}

Requires:

"canWaterShineCharge"
"canShinechargeMovement"
"canDodgeWhileShooting"
"canTrickyJump"
"h_canShineChargeMaxRunway"
{
  "or": [
    {
      "shinespark": {
        "frames": 43,
        "excessFrames": 9
      }
    },
    {
      "and": [
        "canMidairShinespark",
        {
          "shinespark": {
            "frames": 38,
            "excessFrames": 9
          }
        }
      ]
    }
  ]
}