Wait for the one pattern (bottom->right) where Botwoon's head passes through the dividing barrier briefly and fire a Super Missile. This takes a long time, averaging one super per minute.

Requires:

{
  "notable": "Back-Side Super Only Fight"
}
"h_canNavigateUnderwater"
"canBeExtremelyPatient"
{
  "enemyKill": {
    "enemies": [
      [
        "Reverse Botwoon 1"
      ],
      [
        "Reverse Botwoon 2"
      ]
    ],
    "explicitWeapons": [
      "Super"
    ]
  }
}

Clears obstacles: f_DefeatedBotwoon