Can't say I expected you to start a fic, Manipulation. Hurrah! =p
The start is a solid enough basis to introducing the character as well as the region, although one problem you have is that compared to the usual trainer fic in which the trainer wakes up, goes to lab, picks Pokemon and starts adventure the only thing offered that would put it different from the norm is the fact it's in a fanmade region with fakemon. The writing is fine although there are some comments I'll make on it, but the premise itself is rather standard. Granted, what happens later may change that, but the beginning thus far is somewhat routine for this sort of fic. Just something to keep in mind I suppose
I initially got a touch confused with the fact that the Granite/Gralite names were pretty similar, so I feel that Granite's name could have been different for the sake of clarity there (and later if Gralite comes up again which I presume it will).
With 'The sun' twice in a row it just adds to the above problem as that's a phrase rather than just the starting word. It also can be avoided; as you talked about the sun in the first sentence, you could have just gone with 'It glazed the...' for the second sentence and help with that problem.
I am a bit unsure with your usage of semi-colons as well. They are more to tie together two sentences together on the same subject (so you can say "The dog was big; and angry too." but not "The dog was big; I walked on.") Although in this sentence I suppose you could say this is the case, using it twice really drags out the sentence a lot and makes it more of a run on than anything. Try splitting it up into a couple or few instead. The last sentence is certainly a run on as the comma before unfortunately doesn't work in joining the two parts nicely, and the semicolon after it doesn't work too well (joining talking about the trainers and tree, and a gym behind it seems a bit of a stretch).
'A large lump', and 'the lump' was another case of repetition that I feel could be avoided the second time around. After all, we know what is being talked about already so saying 'Granite was rubbing it in an....' would work (if still seem a bit over explanative after it too in why he did it). I would also split up the sentence and adjust the latter half with tenses. Before it you are in the past (shouted, reached) and then sort of go to present (rubbing). The wording is a touch awkward.
"Hello," said the man.
"Hello!" said the man.
"Hello." Then the man jumped.
You cannot use full stops in dialogue either unless what follows is a new sentence, but stuff like ! and etc is fine. (For another way to identify what to us, read the part following the dialogue. 'Said the man' sounds odd as a sentence by itself, so it can't work as its own sentence due to referring to something else like that).
Despite all the crit it is a decent start. It just needs a bit of cleaning up with various aspects of grammar is all. Good luck with your fic!