NO RANDOMNESS! It makes the hack seem unbearable "Here, have a Pokedex"... Why?
Grammar - Check it!
Maps - Improve, not natural enough! Also, play through your maps, checking there are no errors (Especially with the borders!
Scripts... Need work.
Tiles - Insert your own! Mine are good as a start point, but you need to add your own!
Cannot access the cave - Wrong entrance on it as well.
Beginning is kinda... Weird.
Also, remember something as well. Make sure the hack is good. Do not depend solely on the tiles. If I catch you making a poor hack, i will try to make sure you stop using the tiles, as I hate people using good tiles, but poor scripts and maps.
Go to Pallettes - Show Pallette Editor. Select the pallette you are going to edit, then select the colour, and edit the RGB value. It goes in multiples of 8, so you need to round the RGB to the nearest 8.