http://ryancthompson.deviantart.com/#/d5haodh
With the release of the generation V sequels, and the distribution of another event exclusive legendary, I thought I`d depict my version of what I think this pokemon`s original form would have looked like. Genesect draws parallels to Mewtwo, as a scientifically enhanced improvement on the species it came from, so I based this concept pokemon on Mew; and since Genesect is based on a prehistoric cockaroach (supposedly), I also drew inspiration from some blattoptera and ancient mantids as well.
I designed it to look cute like Mew, while giving it features that could make it dangerous as well: large grasping foreclaws and energy charged wings. I also thought that it should look like something that Team Galaxy would take one look at and say, "It's nice... but we definitely need to improve on that."
I think it only stands to reason that there would be an original pokemon that Genesect is created from, and I guess we'll find out in the next generation whether that's true, and if so what it looks like; but until then, this is what I think it might look like. I'm curious to see what others think/come up with.
