It is not. In fact, if I recall, my first mission in the original was something similar. I know better than to add someone else's character into my post without their permission, especially in a circumstance such as that. I don't like powerplaying, and there are plenty of magikarp in the world. I can understand why you would be suspicious of this, but, no, this magikarp is a completely normal one that is somewhere in some puddle being attacked by a trio of foreign pokemon.