Let me tell you something very, very honest: NOBODY, unless they have tons of previous experience in different kinds of writing, is going to be perfect with their first Pokemon fanfiction. Nobody. Not me. Not a commonly-recognized fanfiction author. Nobody.
You can't just post your first fic and expect people to think it's great, especially not on a "professional" forum like this one. In fact, no matter how long you've been writing and no matter how good you think you are, you can't expect absolutely no constructive critisism whatsoever. I don't care if you are a Pokemon fan who just learned how to write or the author of a bestselling book. There will always be flaws, and it is up to you and your loyal reviewers to exploit those flaws, give you advice on how to fix them, and help you on the way to becoming the best writer you can be.
We do not want you to quit writing! Get that out of your head, for goodness sake! We love to see new writers come to this forum and present us with their ideas in the forms of new fics! You know why? Because we get to be a part of helping them get better. Fanfiction is a great kind of writing because people will assist you with it and give you clear, direct advice. It's almost a different way of learning.
Remember me saying if we were trying to be mean, we would flame you and not give you advice? The same applies here. If we wanted you to quit writing, if we wanted to insult you, or if we wanted you to give up, we would not be providing you with these kinds of constructive-critisism reviews.
It's exactly the opposite of the way you see it, my friend (well, if you're okay with me calling you "friend"... ). Contructive Critisism isn't our way of telling you to quit writing. It's our way of encouraging you to write more. We want you to feel like you need to fix the problems we've mentioned for you, not simply quit and leave forum. That way, we will all be able to enjoy your fic that much more, and you will mature into a much better writer.
If you still are not convinced, think of it this way. What if you were in school, and you had a serious problem in Math. (I'm not implying that you do, of course, but I'm thinking this might be a good example) Say, to keep it simple, you did not know how to divide properly at all. The problem is, you aren't aware you have this issue, and think that you are dividing just fine. Which would you prefer your teacher to do: Say nothing and if you ask tell you there is no problem with your math skills, or discuss it with you and point out what troubles you have along with how to improve.
Now, of course, if this teacher said nothing and let you be, you would likely fail the grade for not having an important Math skill. However, if the teacher told you what was wrong, eventually you would feel compelled to fix the problem, and then you would learn to divide just as well as anyone else. This is like your situation. If we said nothing about your problems, you would never improve, and no one would actually enjoy your fics. See where I'm going?
*clears throat* Phew... Well, I must apologize for such a wall of text, but I really don't want to see you give up, and I'm sure no one else does either. I want you to know that was as honest and sincere as I could be, so I hope it actually helps.
Oh yeah, and if you still have doubts, see how many people are replying to this? Notice how nobody is telling you to give up? That's what I mean by "nobody wants you to quit". Keep writing! There's no reason for you to quit now!