On entry, kill or dodge the first Rinkas then Crystal Flash almost directly above or below a Rinka Spawner. It may help to place the Power Bomb against the door, roll away and roll back to avoid the bomb boost.

Requires:

{
  "obstaclesCleared": [
    "R-Mode"
  ]
}
"canRModeCrystalFlashInterrupt"
{
  "ammo": {
    "type": "Missile",
    "count": 10
  }
}
{
  "ammo": {
    "type": "Super",
    "count": 10
  }
}

Resets obstacles: R-Mode

Dev note: This is not possible in G-mode, because the Power Bomb will kill the Rinka and prevent more from spawning.