The screen went blank as soon as I started the game, so when the game launches. It stays blank until I replace the batteries.

Yes, but it may be normal. Try waiting for 20 seconds before replacing the batteries and it might work

edit: On my 83+, the screen stays blank for 5 seconds. If you wait for more than 20 seconds, I don't know where the problem comes from

Is there any chance that the source code will be released?

I don't think so, for mainly two reasons.

This is my first program, that I started when I was a complete noob. So if you read the code, there are chances that you will laugh at me very bad

Secondly, this is a very huge project in which a lot of work have been put, and I really don't want to have it stolen. MisterOops for example is a program that I don't really care about. I don't even remember giving me any credits in it. But Pokemon is the game everyone wants, and I really don't want anyone to put Quigibo or Hot_Dog away from the credits to put himself in.

Hmm I see. You could post parts of the code, though. (i.e. I'm quite interested in the battle engine )

Haha ! The battle engine is the worst part of the code
It takes 9936 bytes of the total
(well, a bit less because the sub program also contains the inventory and some subroutines, but it is surely  >9001)

Well in that case poke runer about it
And I could probably help you recoding the whole thing.

Well after reading 2 lines of code, Runer will refuse saying "wat's dat work ? I can't even work on that"
Also, I 'd still like my code to stay readable in case I want to add things in it
But yeah, if he can optimize it a bit while still having it readable, that would be great
But the problem is that optimization is not only about Axe but I am sure It can even be optimized it from an algorithmic point of view -.-°

Hope its not rude to make a request but,  could you please add like one line of code that will check that a pokemon encountered (in wild or trainer) it high enough leveled for its evolutionary form?

Many of my friends have noticed this, and i think it could be simple to fix.

Basically, he wants you to check if an enemy pokemon's level is enough for it to have evolved and if so, make it the evolved form. Probably also the reverse.
So that you don't find a level 50 Machop or level 5 Machoppeur (sorry for the french names, I never played pokemon in another language ).

I wonder if there has been more progress on this lately? 

Ok, so you want not to encounter evolved forms if their level was too low to be an evolved form. Sounds like a 2 lines of code modification
I added this on the to do list

I wonder if there has been more progress on this lately? 

In fact, yes.
I put all the text in appvar for two reasons:
-save space in executable (approximately 2000 bytes)
-easier to change and make languages packs
But that is not enough to make an update