It could be a great troll move from nintendo, add a Gyarakarp-like evolution for Magikarp (like it evolves into it when only used against weaker pokemon or as a "send and switch" mon), give it stats that are Magikarp's + .005, and don't show it before the game launch.
The correct answer is " something Awesome yet Terrifying".
Though in all honesty a lot of these fusions look like they would be more at home in Digimon. Because as much as I love Digimon I freely admit "Batshit Insane" is more likely to happen there. Hell they already have a robotic poo that transforms into a damned Ninja.