Most Devastating Pokemon

Mine are Tentacools they are annoying

if you mean at the start of a saved game when you only have weak pokemon then i would agree, the Tentacool family is very annoying, especially if you have Treecko.

Another one would be a Golbat. They're probaly in every caves.
They're also annoying with it's confuse ray and whenever I try to run I can't.

nothing is hard in game be it Golbat or Tentacruel... i love tentacool as it's just such an excellent source of SpDef EV. Golbat and Zubat in the underwater cavern is the Spd EV heaven. Both of them are very lovable.

whatever with substitute is devastating... >_>; Sub/Fpunch, sub baton pass, sub anything is devastatingly destructive.

I Like Crobat He Is So Cool And Fast XD

Well, there arnt many devisating pokemon it more like annyoning. Exspecaily the little weak level 2s and 3s. KO them all!!!!!

I Mean Like If You Have A VERY Weak pokemon

Porygon has the potential to be extremely devastating; having an elemental resistance is key, and Porygon can do them all.

What's devastating is my swampter. >:) He can destroy almost anything, and he can even annihilate a grass pokemon, even if it is at a high level.