I see what your saying, but my main theory was that Mew created Pokemon, and wanted itself to be represented among common Pokemon, so it made Ditto. I used the Bible story for comparison, but a creator making a less powerful representation of itself isn't only limited to a specific religion. Also, there is one creator in the Bible, while in the Pokemon legends there are several creators. My theory agrees with, since Mew created Pokemon while other Pokemon created other aspects to the Pokemon world. The Bible comparison was just for relating the part about Mew creating Ditto in its own image.