First, catch an Articuno. It will know Mist, Agility, Mind reader, and Ice Beam. DO NOT delete Mind Reader. train it to level 85(that's when it learns Sheer Cold) and teach it Sheer Cold. Now, get into a battle. Use Mind Reader and on your next turn use Sheer Cold. it's an automatic K.O.! (Note: remember that Sheer Cold only affects pokemon with a lower level then the user. DO NOT attack higher-level pokemon!)