This is a long climb, and getting around the fish under the missiles can be tricky or slow. Overloading the PLMs can be done with as few as 2 PBs if they are placed precisely. Place them two ledges above the item - to the left of the morph tunnel item. It is important that they are placed on either of the flat tiles, not the sloped tile on the right. Afterwards, freeze a crab on the edge of the speed blocks, such that Samus can jump inside and stand on the crab. Exit G-Mode and rotate to obtain the item, then kill the crab with Wave Beam to fall back down.

Entrance condition:

{
  "comeInWithGMode": {
    "mode": "direct",
    "morphed": true
  },
  "comesThroughToilet": "no"
}

Requires:

{
  "notable": "G-Mode Overload Speed Blocks then use Frozen Crab"
}
"h_canArtificialMorphIBJ"
"Gravity"
"canTrickyUseFrozenEnemies"
"Wave"
{
  "or": [
    "h_canArtificialMorphJumpIntoIBJ",
    "h_canArtificialMorphDoubleBombJump",
    "h_canArtificialMorphStaggeredIBJ",
    "canBeVeryPatient",
    "h_canArtificialMorphPowerBomb"
  ]
}
{
  "ammo": {
    "type": "PowerBomb",
    "count": 2
  }
}