There was a topic in Stark about this, but it hasn't been added to the analyses so I am going to post it here. I forget if I run exactly what that topic mentioned, so you guys can comment on it here. I'm obviously going to post what I specifically used and what I specifically found to be effective.
http://www.smogon.com/dp/pokemon/froslass
[SET]
Name: Frustrating Froslass
Move 1: Spikes
Move 2: Thunder Wave
Move 3: Substitute
Move 4: Ice Beam / Confuse Ray / Destiny Bond
Item: Bright Powder / Leftovers
EVs: 4 HP / 252 SpA / 252 Spe
Nature: Timid
[SET COMMENTS]
<p>When paralyzed, an opponent has a 54% chance to hit Froslass (with Brightpowder) in Hail (assuming the move is 100% accurate). This means that, on average, Froslass only requires two Substitutes before the opponent will miss, and it can then easily set up Spikes. This set's purpose is to frustrate the opponent, add up the Spikes, and possibly force the opponent to make a bad play once he continually misses and realizes he has to deal with three layers of Spikes and no way to Rapid Spin them away, as Froslass is a part Ghost type.</p>
<p>Ice Beam is preferred in the last slot over Confuse Ray both because it is a STAB attack and because the only Pokemon immune to Thunder Wave (besides Volt Absorb and Motor Drive Pokemon), are Ground types, which take Super Effective damage from Ice Beam. However, Confuse Ray can be used for the additional annoyance it brings. If confused and paralyzed, the opponent only has a 30% chance to hit Froslass (this time with Leftovers), meaning Froslass can easily Substitute, Spikes, Substitute, Spikes ad nauseum. Destiny Bond is another option for this last slot, as it allows Froslass to take out specific counters, or what Ice Beam does not hit for at least neutral damage. Be aware that should Froslass not run Ice Beam, it will be completely susceptible to Taunt and be forced to either switch or Struggle on the following turn.</p>
<p>If Ice Beam is chosen, the recommended item is Brightpowder, to reduce the enemy's ability to hit Froslass to 54%. If Confuse Ray is chosen, Leftovers is preferred to possibly obtain an extra turn of Substitute. Also, if Confuse Ray is chosen, there is no need to have Special Attack EVs, so run 244 HP / 12 Def / 252 Spe, for 342 HP, to be able to substitute again after 4 turns of Leftovers recovery.</p>
http://www.smogon.com/dp/pokemon/froslass
[SET]
Name: Frustrating Froslass
Move 1: Spikes
Move 2: Thunder Wave
Move 3: Substitute
Move 4: Ice Beam / Confuse Ray / Destiny Bond
Item: Bright Powder / Leftovers
EVs: 4 HP / 252 SpA / 252 Spe
Nature: Timid
[SET COMMENTS]
<p>When paralyzed, an opponent has a 54% chance to hit Froslass (with Brightpowder) in Hail (assuming the move is 100% accurate). This means that, on average, Froslass only requires two Substitutes before the opponent will miss, and it can then easily set up Spikes. This set's purpose is to frustrate the opponent, add up the Spikes, and possibly force the opponent to make a bad play once he continually misses and realizes he has to deal with three layers of Spikes and no way to Rapid Spin them away, as Froslass is a part Ghost type.</p>
<p>Ice Beam is preferred in the last slot over Confuse Ray both because it is a STAB attack and because the only Pokemon immune to Thunder Wave (besides Volt Absorb and Motor Drive Pokemon), are Ground types, which take Super Effective damage from Ice Beam. However, Confuse Ray can be used for the additional annoyance it brings. If confused and paralyzed, the opponent only has a 30% chance to hit Froslass (this time with Leftovers), meaning Froslass can easily Substitute, Spikes, Substitute, Spikes ad nauseum. Destiny Bond is another option for this last slot, as it allows Froslass to take out specific counters, or what Ice Beam does not hit for at least neutral damage. Be aware that should Froslass not run Ice Beam, it will be completely susceptible to Taunt and be forced to either switch or Struggle on the following turn.</p>
<p>If Ice Beam is chosen, the recommended item is Brightpowder, to reduce the enemy's ability to hit Froslass to 54%. If Confuse Ray is chosen, Leftovers is preferred to possibly obtain an extra turn of Substitute. Also, if Confuse Ray is chosen, there is no need to have Special Attack EVs, so run 244 HP / 12 Def / 252 Spe, for 342 HP, to be able to substitute again after 4 turns of Leftovers recovery.</p>






















