You're looking for a 16 hour Breeding/ incubation time and your best choices for breeding are
Lightning Dragon + Swamp Dragon
Lightning Dragon + Seaweed Dragon
Lightning Dragon + Rust Dragon
|Adult Plasma Dragon (Picture by Kayla!)|
Since I haven't been able to breed this one yet, pictures are pending lol. If you manage to get one before me feel free to email me a pic and your Gamecenter username so that I can credit the picture to you!
If you want to add me in the game my gamecenter name is prplrush. Feel free to follow my blog for more updates, via google friend connect. (right below this post) and google + this post