I seem to recall somebody posting something from Pokemon Adventures [http://en.wikipedia.org/wiki/Pokemon_Adventures] comic where an Arbok gets severed clean in half.
[http://img149.imageshack.us/i/arbokgetsownedot6.png/]
So, hey, these are tame compared to that particular bit of official Pokemon material.
However, clearly the greater body of Pokemon canon prefers to consider Pokemon as being made out of unbreakable, rubbery, shiny material that is apparently immune to all the physical abuse it will inevitably take.
You know, just like anime's portrayal of women. *rimshot*
(Okay, that was in bad taste but too true to resist pointing out.)