Kill a Zebbo so that its drop is out of the way then Crystal Flash so a Zebbo can hit Samus from below and trigger reserves. The positioning of the Crystal Flash is pixel-perfect; Samus must be overhanging one of the Zebbo spawners while on the last pixel of the ledge. Note that a Zebbo will usually not deal enough damage to Samus to trigger reserves. One way to make this fairly reliable is to wait for its drop to dissapear then quickly place a Power Bomb such that it explodes and kills a Zebbo and Samus immediately collects its drop as she lands.

This can only be done with no enemy damage reduction and no E-Tanks. When placing the Power Bomb quickly after the drop disappears, it may be best to be hanging off the left, so the bug hits the right side of Samus. When placing it 15 frames after the drop disappears, there is an 11-frame window, of which 10 frames will work. Otherwise, randomly placing the Power Bomb there is approximately a 60% chance that the Zebbo will trigger reserves, regardless of which side Samus is on.

Entrance condition:

{
  "comeInWithRMode": {}
}

Requires:

"canComplexRModeCrystalFlashInterrupt"
"canBeLucky"
{
  "ammo": {
    "type": "Missile",
    "count": 10
  }
}
{
  "ammo": {
    "type": "Super",
    "count": 10
  }
}
{
  "ammo": {
    "type": "PowerBomb",
    "count": 5
  }
}

Dev note: This can not be done in G-mode, because the Power Bomb will kill the Zebbo and prevent more from spawning. TAS-ing this out, there were 58 frames where the bug would reach Samus and 34 on the left worked, 33 on the right worked. But, if subpixels matter, this might not be accurate, as it was only tested with one random subpixel value.