Enter in R-mode or direct G-mode, and perform a Crystal Flash in the morph nook to the top-left of Mother Brain. During the Crystal Flash, allow the Rinkas to damage Samus down and trigger an auto-reserve refill, which will interrupt the Crystal Flash.

The interruption of the Crystal Flash (due to the R-mode forced standup) limits the damage that Samus takes during it; After the reserve trigger, Samus will take just one more Rinka hit.

Entrance condition:

"comeInWithGMode": {
  "mode": "direct",
  "morphed": true
}

Requires:

{"notable": "Moondance Clip"},
{"not": "f_MotherBrainGlassBroken"},
"canTrickyGMode",
"h_artificialMorphMovement",
"h_artificialMorphCrystalFlash",
{"resourceMaxCapacity": [{"type": "RegularEnergy", "count": 299}]},
{"autoReserveTrigger": {"minReserveEnergy": 100}},
{"enemyDamage": {"enemy": "Rinka", "type": "contact", "hits": 1}},
{"gainFlashSuit": {}}

Dev note: Having a small amount of E-Tanks ensures the reserve tanks can be filled by the Crystal Flash before the auto-reserve trigger. FIXME: A larger amount of E-Tanks can also work, but the reserves will not completely fill, so less energy would remain at the end.