Christ, TurtleKing, give it a rest already. Haven't we already gone through whole posts about Hanako reviewing you and such? Yes, people are reading your fic... I'm not (given my bias against literary narratives, I shouldn't really count, anyway), but others are. Now please stop making spammy posts asking that same question or I'm going to report you.
Scythers are unique in that their language, as far as my fanon goes, is heavily based off of Japanese. (Example- Scyther word for "He's dead" is more exactly translated to "He has honorably deigned to cease to exist.) XD
How is that based off of Japanese? They DO have a word for death and therefor a simpler way of saying someone's dead. 死んじゃった "Shinjatta", "(implied subject) died" (in Japanese, the subject is rarely necessary in a sentence and things can be left entirely to implication. That's not to say they can't use the subject, though if you really think about it, most things are obvious anyway. It might be hard to notice for an English-speaker, because doing such a thing in our language and just saying, for example, "Died" just sounds really awkward). In some cases that I'm aware of, they'll say なくなちゃった "Naku nachatta" or literally "(implied subject) became non-existent", which is still off from what you've got. Now, I haven't looked much into older speech forms, namely those used by samurai (all I really know is that their first-person is "sessha" and their copula is "de gozaru"), but who knows? Maybe your example is derived from that, since Japanese are quite often portrayed to talk that way in stereotypes (stereotypes which would, obviously, appear to be outdated).
Anyway, aside from that, I agree with everything else you said in your post, Mr. Art Critic (BTW, think you could critique my doujinshi whenever I get around to releasing it? ^^). I too would prefer to portray that Pokemon aren't capable of forming a language in my canon (although, they can learn to speak our's, like Meowth in the anime). They can, however, have their thoughts conveyed through Psychic-types. But I think it's worth noting that, oddly enough, every canon, whether it portrays Pokemon with their own language or not, indicates that Pokemon can somehow understand human speech. This is evident from the obvious way you're able to command Pokemon immediately after capture. Although, it is possible one can make sense out of this and approach this as something out of a dog's obedience school. This can explain why, even if elemental skills are implied to be second nature, most Pokemon only start out with a basic Tackle or Scratch attack: they need to be instructed to learn the command for later attacks. Given, this wouldn't explain how a Pokemon can differentiate between a human's command for Growl, or similar early stat-lowering moves, or how capturing a higher-level Pokemon that knows such attacks can recognize the command (legendary Pokemon could be an exception: having existed for so long, they no doubt picked up some aspects of human speech), but the idea itself still seems worthy of consideration, I think.