Seven Deadly Sins said:
Crobat beats Froslass with Taunt,
How does Crobat beat Froslass? I guess it can, but Froslass has a decent chance.
Froslass has about two options against Crobat: Ice Beam and Spikes. If Crobat Taunts, Ice Beam beats it. If Crobat U-Turns to, say Houndoom, Froslass gets a layer of Spikes down. If Crobat Brave Birds, Froslass wins both ways, but it eliminates much of the guess work for the Crobat user.
Taking Ice Beam further: If Crobat Brave Birds or Taunts, Froslass wins via Ice Beam.
If Crobat Brave Birds, Froslass will kill it. It then can be killed by a Scarfed Pursuiter, which will make the score 1 - 1, but then your opponent is in control of the battle and has the opportunity to set up Stealth Rock with their Steelix or hit something hard with their Blaziken. If the Pursuiter is not Scarfed, Froslass gets a layer of Spikes down and dies, unless you happen to be using Ambipom, Sceptile, Swellow, Floatzel, or Tauros. Swellow is pretty outclassed by Staraptor, Sceptile and Floatzel are not common, nor are they commonly seen with Pursuit. Tauros is dependant on a Speed tie. Ambipom is the only one I would expect to see win in this case. A non-choiced, non-STABbed Pursuit isn't very viable in my eyes as well; again, only Ambipom looks to apply to this example.
If the opponent chooses not to use a scarfed Pursuiter, Froslass switches out if the opponent is faster and has priority, or Spikes/Destiny Bonds slower opponents. Taunt if it doesn't want Stealth Rock up.
If Crobat Taunts and Froslass Ice Beams, Froslass can still switch out. The opponent will have to Pursuit it to prevent it from easily coming back in. Pursuiters who don't really mind Ice Beam are specially defensive Drapion, Floatzel, Hitmons, Houndoom, Spiritomb, and Umbreon. Of these, only Houndoom, Floatzel and Spiritomb are really apt to the task. The others lack reliable recovery, and will not appreciate being hit by Ice Beam, or are weak, like Umbreon.
If Crobat U - Turns and Froslass Ice Beams, we come to a similar scenario with Brave Bird, only Froslass has more health and Crobat is alive. This is basically the only situation in which the Crobat user is in the advantage spot. Again, Froslass can switch out, unless in the face of Pursuit. Choice Scarfed Pursuits again will let stuff like Steelix set up Stealth Rock, but in the previous scenario, it would be 5 - 5 with your opponent in control.
No unboosted Pursuit has a chance of killing Froslass if it stays in, even after U-Turn. Absol does, at max, 81.85%. Jolly Crobat's U-Turn is 16.73% max. No banded Pursuiter can KO a Froslass and outspeed it, except for Ambipom who has a bit less than a 1 / 3 chance of doing so. The other Pursuiters have a 50% chance of winning; Pursuiting the switching Froslass or killing it with a better attack as it stays in. Whatever Pursuiter you use is pretty irrelevant.
Basically, Banded Pursuiters are outsped and one layer of Spikes is laid down. Scarfed Pursuiters have a 50% chance of winning.
Summary: The team with Froslass will generally have an advantage if it Ice Beams. For Crobat to win a matchup vs Froslass, there must be a Pursuiter.
Addressing Froslass Spiking: If Crobat Taunts, Froslass loses...sort of. Team Crobat gains control of the battle, but Froslass can still switch out unless said Crobat has Pursuit (and Froslass may choose to stay in, though that's probably unlikely and not a very good idea.)
If Crobat Brave Birds, Froslass switches out, and is probably more of a nuisance than a real threat if you can set up SR quickly enough.
If Crobat U-Turns, see scenario 3 above. Only Froslass is probably in a better position.
Yeah, I got tired as I was getting to the Spikes part.
TL, dr: I don't really see how Crobat wins against Froslass. I probably went a bit too far in depth into this. Your post intrigued me when I first read it because of the whole "beat Froslass thing." Anyway, my point is, I just wanted to know what your method is of dealing with Froslass whenever you encounter it, because I haven't really had much success in terms of Crobat vs Froslass, and as shown by my spiel above, I can't fathom how.