First off, I think you should watch the whole 'size' thing since this forum uses numbers for sizes (ranging from 1 to 7) and not letters. So yeah, you probably need to adjust your post to fix that, as well as fixing that for future posts.
Also, the formatting should be spaced out with an extra space between paragraphs, just as I'm typing out this review. Press enter twice every time you finish writing a paragraph. It's easier to read.
And here are a few nitpicks:
Pokemon....people.....legends say we were once
similar.
Ellipses are three periods (...) and not four, or five for that matter. Also, I don't think the first ellipse is exactly necessary. The sentence might flow better if you used 'and' instead of '...' In addition, similar doesn't seem to be quite the right word you're looking for, because later on you say that people and Pokemon connected souls, so that leads me to believe they were practically identical in a way. I just don't think similar describes it well.
The two
groups used to be able to connect souls.
You don't need to say 'groups' here because the readers already know which groups you are referring to, so 'two' would suffice as the subject.
Attacks
became more powerful, and the person felt the Pokemon's pain.
I believe the verb you want to use here is 'were' because it's referring to the attacks in the past tense.
Pokemon are gradually becoming nothing more than tools used by
lazy people and violent people who can't fight their own battles.
Nice little description. It really shows the narrator almost hating humans. Kind of like N would think, except maybe not so insulting. But, the bolded bit of text is a tad too wordy, since you could condense it to less words. 'Lazy, violent people' is one possibility you could use. The point is that you don't need to say people twice, because it's the same subject. Say people once, otherwise it gets a bit repetitive.
Dozens of cuts appeared on my skin from the leaves flying at the Pikachu in front of me.
This part confused me a bit, partially because it's said that the leaves were flying at the Pikachu, yet still cut the narrator. I can't understand that, so I believe some clarification is needed.
Am...am I dreaming, or is this
really real?
Really real sounds a bit repetitive because they almost mean the same thing in this sentence. Like you wouldn't say 'hot fire' because everyone knows fire is hot. So here, you should take out the 'really.'
The narration can be a bit confusing, especially towards the end. There are the narrator's thoughts written out, and it helps give the readers a background of what the story might be about, but then it jumps to what it seems to be a battle. And that's when it got a bit confusing. It's a rather big jump and almost seems out of place, so I think you should have another paragraph or so to help readers with the transition from the narrator's view of the past to the battle, which is probably the present.
I liked the idea behind Pokemon and people connecting, and I'd like to read more about it. If trainers got hurt every time their Pokemon did, that would drastically change how they would battle. So I suppose I'll have to follow this story.