There are plenty of maps on Spriter's Resource from all the Pokémon games, from Gen 1 right up to Gen 5, that you can use for reference (reference only, NOT to be placed into your game as-is) and find out for yourself what a good Pokémon map looks like. No-one here started off with an intrinsic idea of how to map well, we learned it by studying the maps in the games that we liked and teaching ourselves how the professionals put them together so we can do the same ourselves. If you take the time to hunker down and look at and learn from the resources available to you, you WILL learn, but if you admit defeat before even trying then you'll never progress. You're presumably on here because you do have ideas, so don't say you're not imaginative because it's patently untrue, just as it's untrue for everyone else on the forums. You have an imagination, so train it, feed it with knowledge and most importantly don't be afraid to make bad maps or bad games as part of the learning process, and it'll develop into what you need it to be.