You're browsing the GameFAQs Message Boards as a guest. Sign Up for free (or Log In if you already have an account) to be able to post messages, change how messages are displayed, and view media in posts.
Fire / Flying / Dark / Ghost / Rock moves, non-Fighting / Normal attacks from a Mold Breaker Pokémon, Poison, Burn, Leech Seed, Confusion damage, Sandstorm, Hail, Spikes / Stealth Rock, Nightmare, Darkrai’s Bad Dreams, Life Orb recoil, Double-Edge recoil, Struggle, Struggle recoil, Destiny Bond, Perish Song, Aftermath, Rough Skin, Future Sight / Doom Desire, Ghost-type Curse, Jaboca/Rowap Berry recoil, and absorbing health against a Pokémon with Liquid Ooze.
In essence, we can consider that Shedinja has about 19 "weaknesses" (not counting the useless ones, like Future Sight).
The scary part is that there are 17 types in the game, but of course no pokemon is weak to all types; and most pokemon aren't OHKOed for sure by their weaknesses. Shedinja, on the other hand, has a whopping 19 weaknesses and they're all a OHKO.