Why is everybody voting Dragon? CaP is all about exploring niches within the metagame. Now, as a Dragon type, this CaP would have automatic guaranteed access to Draco Meteor and Outrage, as all the precedents in the game, no exceptions, indicate. Now, assuming it doesn't have crap attacking stats, it WILL use those, because they are both powerful moves that are almost totally un-resisted. If it does use them, it just becomes a Dragon type sweeper, something which the metagame is already saturated with, so that option is a no. In order for it not to be a sweeper with those kinds of moves, we will have to nerf it's attacking stats to hell, making it almost bound to be a wall, and Elec/Dragon is a shitty type for walling, possessing weaknesses to Ground, Ice, and Dragon, the three types a wall wants to be weak to the least! There is absolutely no future in Electric/Dragon.
My two cents. Feel free to ignore.