Just a heads up - centreing and changing the font of the text for fics makes it really hard to read.
Here's a post explaining more on that subject.
Another note is that punctuation is missing in dialogue (which is a common enough error anyways, but still!). For instance:
“Here's your Salad” A more than larger lunch lady grunted as she shoved the plate of greenery onto Tina's tray.
You'd want to add a comma after salad and change the capital 'A' after the quotation mark to a regular small 'a'. (And btw salad rather than Salad as it is not a proper noun - there are some other instances of that too lik Red which should be red... and 'large' would work better than more than larger). Ie:
“Here's your salad,” a large lunch lady grunted as she shoved the plate of greenery onto Tina's tray.
Reason for that is that punctuation is required before a closing set of speech/quotation marks, be that a hyphen, full stop, comma, exclamation mark, etc. Here a comma works as the part following the dialogue can be treated as one full sentence with the dialogue (e.g. like '"Look at that dog," the man jeered.', with 'the man jeered' continuing on from the speech, as opposed to '"Look at that dog." The dog did a backflip.' - with 'The dog did a backflip' being seperate from the dialogue and hence being its own sentence). That's also why 'A' should be 'a', as you treat the whole part as one sentence, and hence no capital letter (because it's not the start of a new sentence). Note here you essentially ignore the "" marks.
“Um... I'm sure something moved” She nervously commented at the salad.
“Take it or leave it” She grunted once more before serving the next student.
Same deal here - should be rather:
“Um... I'm sure something moved,” she nervously commented at the salad.
“Take it or leave it,” she grunted once more before serving the next student.
I'll also add that although the events seem interesting enough (sudden attack from some ice types), there's not that much in the way of description or character reaction - for instance Tina does not really react much to the fact that she's a Pokemon now and on a beach. Consider what she may be thinking for instance, and add it in, which'd make it more entertaining to read, and more realistic too.