Shedinja is a Pokemon with 1hp, that can only be beaten directly by a super-effective attack or by secondary effects like weather, burn, poison...or an item like Black Sludge which damages the holder every turn. Using protect on turn 1 means it can't be hit by anything, and then it faints.
But it only "faints", it doesn't die, so. I'd also say that's the weakest incarnation of Shedinja, but Shedinja itself is not fundamentally weak. I mean, it's base stats far exceed that of Magikarp for instance, or its pre-evolution (Nincada). It's down to how you interpret Shedinja as a character I guess. It CAN have the poorest durability possible, but it doesn't always.
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