Entrance condition:

{
  "comeInShinecharged": {},
  "comesThroughToilet": "yes"
}

Requires:

{
  "shineChargeFrames": 10
}
{
  "shinespark": {
    "frames": 40,
    "excessFrames": 18
  }
}

Dev note: Entering through Toilet will center Samus horizontally, making a few more shinecharge frames required It possible to end spark earlier by precisely bonking the island in the center, but the energy savings do not seem important since you can farm Choots afterward anyway.