Future Sight may seem good, but it isn't really. In-game it isn't too bad, but in competetive, the opponent can just switch into something like a Dark type, and completely avoid it altogether. Psychic or Psyshock is much better for competetive, but in-game, you might even try both, but more often than not the battle will be over before Futire Sight has even taken effect. Overall, using Future Sight is not advisable.