A few weeks ago, after watching the Pokemon: The Origin, I really started to notice some really terrible things that really bothered me, mostly the battling. Just then, when I went back to the Pokemon Special Manga (commonly called Pokemon Adventures) I noticed the same issues. If that wasn't enough, I looked at a reletively old episode of the Pokemon anime and, sure enough, had the same problem.
Let's look at a more recent example in Pokemon: The Origin special. In the battle of Red and Giovanni, there comes a point when they use a Rhyhorn and a Jolteon, respectively. Jolteon is easily knocked out, considering that Rhyhorn is a Rock/Ground type after all. However, there are two things wrong with this scene:
Rhyhorn uses Thunderbolt. Okay, that's all right. He can learn that via TM. It uses it on a Jolteon. ...Okay... that's... strange. It won't do much damage -- wait, a one-hit KO? How did that happen? Let's take a glance at their Generation 1 stats.
Here are Jolteon's Generation I stats:
And here are Rhyhorn's:
In Generation 1, the Special stat acted as both Special Attack and Special Defense. Now, since Jolteon's Special stat was 110, it can take quite a beating from Special moves, with Thunderbolt being one of them. Since Electric obviously resists Electric, combined with Rhyhorn's hideously low Special stat of 30, the damage isn't that amazing; non-existant at worst. So how can something like this possibly accomplish that scene above?
Before you say "Oh, this anime can play by its own rules," allow me to tell you two things why that's a stupid mentallity. First off, Pokemon Origins was meant to be as accurate to the game as possible, meaning that something like this shouldn't even exist. Secondly, if Rhyhorn can learn Thunderbolt via TM, why doesn't it learn Earthquake or Dig? If the Pokemon can learn moves through special means, why not make the result of the move look believable?
I think I've said enough about that. There are WAY more inaccuracies everywhere in mangas, the anime, If you see any more inaccuracies, I'll list them below. You don't have to limit yourself to this specific anime (but if you did, then that would be fine), so I challenge you to delve deep into other non-canon Pokemon specials, such as the Pokemon Adventures manga (I've seen quite a few) or the Pokemon Anime (I've seen even more).
Here's the list of inaccuracies: