Also, in order to get rid of all that empty space in your towns and routes, why not add stuff like grass, tree branches, stumps, smaller trees, flowers, puddles, ect. to give it a better feel.
Best wishes and I hope this project looks awesome in the end.
Also, the 5 starters are :
Pikachu - Charmander - Poliwag - Machop - Bulbausaur