Although I could probably come up with a semi-unnatural sounding Japanese version of the lyrics, I was curious to see if any Japanese person had already undertook the task of translating the Pokemon Theme song and I found exactly what you are looking for! http://www.geocities.co.jp/HeartLand-Icho/5015/pokemon/howtosay/themesong.html Some of the japanese is more of an explanation than a translation. For example, I would probably translate "Like no one ever was" as 今まで存在しただれよりも (With the implied following sentence being いいポケモンマスタになりたい）. But majority of the lyrics have direct translations.