I have an idea that will make it decent:
Two scientists travel to the beginning of the universe to find out what really happens that created it. They are attacked by a giant MAGIKARP that is patterned like space. As the MAGIKARP is attacking them, the scientists witness seventeeen spikes on MAGIKARP's back glow. They release a light that creates Arceus. To protect the scientists, Arceus creates Dialga, Palkia, and Giritina. Dialga creates time and freezes MAGIKARP in place, Palkia creates space and sends MAGIKARP into another dimension, and Giratina seals MAGIKARP. Arceus forces MAGIKARP to return the scientists to their time, and with the help of Dialga MAGIKARP does so. The fic ends with Arceus creating Groudon and Kyogre, making the earth. Then he makes Mew who creates all living things.