Light Screen
Type: Psychic
Power: -
Accuracy: -
PP: 30
Description: Creates a wall of light that lowers Special Attack damage
Reflect
Type: Psychic
Power: -
Accuracy: -
PP: 30
Description: Creates a wall of light that weakens physical attacks
Reflect and Light Screen are exactly the same move, except one reduces physical, and the other special damage. Each last for only 5 turns, and then you must re-apply the move. Both these moves cut the damage in half, and are still active even if you switch out, which is a plus for your team.
Seeing the sheer dominance of bulky physicals with high Defensive stats, and the fragileness of the best Special sponge in the game, I feel that Light Screen is more essential to a team. Face it, you have more of a hard time trying to find a good Special wall that can deal some damage and isn't going to get raped by Dugtrio.
NOTE: Now, we all now about the other two pseudo-pass moves: Safeguard and Mist. I feel they don't do enough to be seriously used in today's metagame, therefore I felt no need to try to cover it.
Here are some of my favorite examples of Light Screen / Reflect users:
Jirachi @ Leftovers
EVs: 252 HP / rest split between Def/Sp. Def and Sp. Atk
Nature: Bold (+ Def / - Atk) or Calm (+ Sp. Def / - Atk)
~ Light Screen / Reflect
~ Wish
~ Thunder
~ Psychic
Pretty much, this Jirachi is there support the team with either Light Screen or Reflect and Wish, and deal some decent damage with Psychic and Thunder. Thunder with Serene Grace gives you a great chance of paralyzing the opponent.
Now, what you pick should affect how you distribute your EVs and what nature you pick. If you pick Light Screen, put more EVs on Defense and use Bold nature. This way, you can still cut down Special attacks while taking less damage from things like EQ Gross. If you use Reflect, you can either just reverse everything, or you can put EVs on Sp. Def and use Bold still, in order to protect Jirachi from the oh so common ground moves. It's a great support pokemon that can also help you attack wise.
Zapdos @ Leftovers
EVs: 240 Spd / 172 Sp. Att / 96 HP
Nature: Bold or Modest (+ Sp. Atk / - Atk)
~ Thunderbolt
~ Hidden Power Grass / Ice
~ Light Screen
~ Rest
Zapdos's main weakness is Ice, so Light Screen provides it a big help on the Special Defense side, and can still pack a punch with Tbolt. Obviously, the HP Grass/Ice debate rages on, pick whatever suits your team. Nature-wise, go with what you think is best. If you want Zapdos to deal more damage, go with Modest. If you want more support for pesky Rock Sliding Heras and whatnot, and want to have some sort of chance, Bold is the way to go. You can even load up on more Sp. Defense with Calm, but I don't recommend it, you want to balance out your defenses as much as you can.
I really like Zapdos, because with it's decent speed and great special attack, it can help your team in more than just being a special attacker.
Claydol @ Leftovers
EVs: 252 HP / 200 Atk / 56 Def or Sp. Def
Nature: Impish (+ Def / - Sp. Atk) or Careful (+ Sp. Def / - Sp. Atk)
~ Earthquake
~ Reflect / Light Screen
~ Rapid Spin / Ice Beam / Explosion
~ Rest / Explosion
Claydol isn't going to really hurt much with that pisspoor attack, so you can sacrifice some attack for better defensive coverage. You need all 252 on HP, there's no other choice, Claydol has terrible HP, and you need every drop of it in order for it to stay alive. This thing is also a great Rapid Spinner, it doesn't get damage from Spikes you can Spin and set up your Reflect or Screen and then switch to something else. Whatever you pick is up to you, and just like any other pseudo-passing pokemon, keep your defenses balanced, if you use LS, boost up the pokemon's defense, if you use Reflect, boost the special defense.
If you don't need a Rapid Spinner, you can try to put Ice Beam or Explosion on this negro, but you need to use a lot of those precious EVs to do anything worthwhile against Salamence. Explosion is a good idea though, so test it out, it may come in handy against the random weakened Blissey or something.
Other good pseudo-passers: Forretress, Alakazam, Metagross, Ampharos, Meganium, Starmie
Final word: Most good pseudo-passers have Psychic as one of their types, so build accordingly. The dual types may be a better choice to plug in to an existing team. Overall, if your team has defensive problems of some sort, consider adding a pseudo-passer. There's plenty of chances for you to use the move in the Advance metagame by forcing switches. Of course, don't overly rely on this, just like anything else in this game, because everything is counterable.
It's a little bit harder to use this technique because you give up a precious moveslot (and a possible sweeper or other type of support pokemon) for this, so think carefully before you use this. But when used correctly, Light Screen and Reflect and really boost your team's flexibility in terms of staying in against certain pokemon.
Type: Psychic
Power: -
Accuracy: -
PP: 30
Description: Creates a wall of light that lowers Special Attack damage
Reflect
Type: Psychic
Power: -
Accuracy: -
PP: 30
Description: Creates a wall of light that weakens physical attacks
Reflect and Light Screen are exactly the same move, except one reduces physical, and the other special damage. Each last for only 5 turns, and then you must re-apply the move. Both these moves cut the damage in half, and are still active even if you switch out, which is a plus for your team.
Seeing the sheer dominance of bulky physicals with high Defensive stats, and the fragileness of the best Special sponge in the game, I feel that Light Screen is more essential to a team. Face it, you have more of a hard time trying to find a good Special wall that can deal some damage and isn't going to get raped by Dugtrio.
NOTE: Now, we all now about the other two pseudo-pass moves: Safeguard and Mist. I feel they don't do enough to be seriously used in today's metagame, therefore I felt no need to try to cover it.
Here are some of my favorite examples of Light Screen / Reflect users:
Jirachi @ Leftovers
EVs: 252 HP / rest split between Def/Sp. Def and Sp. Atk
Nature: Bold (+ Def / - Atk) or Calm (+ Sp. Def / - Atk)
~ Light Screen / Reflect
~ Wish
~ Thunder
~ Psychic
Pretty much, this Jirachi is there support the team with either Light Screen or Reflect and Wish, and deal some decent damage with Psychic and Thunder. Thunder with Serene Grace gives you a great chance of paralyzing the opponent.
Now, what you pick should affect how you distribute your EVs and what nature you pick. If you pick Light Screen, put more EVs on Defense and use Bold nature. This way, you can still cut down Special attacks while taking less damage from things like EQ Gross. If you use Reflect, you can either just reverse everything, or you can put EVs on Sp. Def and use Bold still, in order to protect Jirachi from the oh so common ground moves. It's a great support pokemon that can also help you attack wise.
Zapdos @ Leftovers
EVs: 240 Spd / 172 Sp. Att / 96 HP
Nature: Bold or Modest (+ Sp. Atk / - Atk)
~ Thunderbolt
~ Hidden Power Grass / Ice
~ Light Screen
~ Rest
Zapdos's main weakness is Ice, so Light Screen provides it a big help on the Special Defense side, and can still pack a punch with Tbolt. Obviously, the HP Grass/Ice debate rages on, pick whatever suits your team. Nature-wise, go with what you think is best. If you want Zapdos to deal more damage, go with Modest. If you want more support for pesky Rock Sliding Heras and whatnot, and want to have some sort of chance, Bold is the way to go. You can even load up on more Sp. Defense with Calm, but I don't recommend it, you want to balance out your defenses as much as you can.
I really like Zapdos, because with it's decent speed and great special attack, it can help your team in more than just being a special attacker.
Claydol @ Leftovers
EVs: 252 HP / 200 Atk / 56 Def or Sp. Def
Nature: Impish (+ Def / - Sp. Atk) or Careful (+ Sp. Def / - Sp. Atk)
~ Earthquake
~ Reflect / Light Screen
~ Rapid Spin / Ice Beam / Explosion
~ Rest / Explosion
Claydol isn't going to really hurt much with that pisspoor attack, so you can sacrifice some attack for better defensive coverage. You need all 252 on HP, there's no other choice, Claydol has terrible HP, and you need every drop of it in order for it to stay alive. This thing is also a great Rapid Spinner, it doesn't get damage from Spikes you can Spin and set up your Reflect or Screen and then switch to something else. Whatever you pick is up to you, and just like any other pseudo-passing pokemon, keep your defenses balanced, if you use LS, boost up the pokemon's defense, if you use Reflect, boost the special defense.
If you don't need a Rapid Spinner, you can try to put Ice Beam or Explosion on this negro, but you need to use a lot of those precious EVs to do anything worthwhile against Salamence. Explosion is a good idea though, so test it out, it may come in handy against the random weakened Blissey or something.
Other good pseudo-passers: Forretress, Alakazam, Metagross, Ampharos, Meganium, Starmie
Final word: Most good pseudo-passers have Psychic as one of their types, so build accordingly. The dual types may be a better choice to plug in to an existing team. Overall, if your team has defensive problems of some sort, consider adding a pseudo-passer. There's plenty of chances for you to use the move in the Advance metagame by forcing switches. Of course, don't overly rely on this, just like anything else in this game, because everything is counterable.
It's a little bit harder to use this technique because you give up a precious moveslot (and a possible sweeper or other type of support pokemon) for this, so think carefully before you use this. But when used correctly, Light Screen and Reflect and really boost your team's flexibility in terms of staying in against certain pokemon.