You have a lot less punctuation in this story than what you need. You need a full stop at the end of pretty much every sentence, and quotation marks around the speech of the characters. Capital letters are also needed for the start of every sentence and the proper nouns. Because it's really difficult to read
nice work jolten return called Alex walking over to Amy to shake hands
and much easier to read
"Nice work, Jolteon! Return!" called Alex, walking over to Amy to shake hands.
You misspell Pokemon names, like "Jolteon", which should be corrected if you're going to be writing Pokemon fanfics. (Unless that was a nickname, in which case, you should have said so.) Otherwise, it doesn't reflect too well on you. Also, instead of saying "more shy of the 2", you should write out the numeral. Otherwise, it really doesn't reflect well on you if you aren't willing to make the two other keystrokes to spell out the word.
Don't center your work. It's more difficult to read because we're trained to read from the left margin to the right. Having lines centered and not having a space between each paragraph gets really confusing, at least to me when it comes to the centering. But a blank line between each paragraph is extremely common practice when posting online.
I suggest requesting a beta reader to help you fix errors before you post. Also, take your time writing your story so that you can catch as many mistakes as you can before you send it out to be read.