Strongest pokemon ever?

I have a darkrai level 100 in pokemon diamond and it is so strong. It has dark pulse, dark void, dream eater and nightmare. If you use dark void, then dream eater, your foe (nearly) faints he even beated arceus (level 100) dialga (level 100) and palkia (level 100). This pokemon is impossible strong. I wonder witch pokemon can defeat him. Pokefandarkrai8 9-7-2013

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