There are multiple options to get off of this island and you're limited on time, the only sane person left, and out of food, so you have to pick one quick in order to survive. You can either take a two-seated boat and strand one of the others, throw out your pokeball and ride your CB DARM's Flare Blitz to safety alone, or admit that Steelix is the best Stealth Rocker in the SM NU tier