I would figure out what battle niche you want the pokemon to be in, and then look at stats for already existing pokemon who fill a similar role. If you want one of your starters to be a speedy mixed attacker than something like Infernape's stats is a good place to start, but of course adjust as...
Overall I think it looks really nice. The map layout is interesting and gives you options. I like the unfinished bridge, it gives the route a lot of personality.
Small tile errors I noticed: The bottom right cliff corner is missing by the stairs. Also there is a tree near the exit on the right...