[Dummy007]

"Guess who's getting a Gengar after this battle? :D That's right, Severus, it's time for you to be awesome. Since Gargantua is using Protect, Arcanine's Extremespeed won't affect it (Extremespeed still outpaces Prankster Encore). That means the optimal first action would be Disabling Jupiter's Extremespeed, since it will have moved already. While it's locked into Extremespeed (and can't use it), use Sucker Punch on Gargantua on Action 2, just in case that combo is legal. If it's just a filler slot and C$FP is messing with us, use Hex instead to use less energy. If I calced correctly, Jupiter will have 3 HP left at the end of Action 2, so finish up with Shadow Ball on Jupiter to steal the KO from Murdoc. If Jupiter has already fainted by Action 3, use Psychic on Murdoc instead. 3 KOC are coming our way!"

Summary:
Disable Jupiter's Extremespeed -> Sucker Punch (if Gargantua's actions are serious) / Hex (if they're not) -> Shadow Ball Jupiter / Psychic Murdoc (if Jupiter has already fainted)