Battle Subway Single Record: 250
Shuckle @Chesto
Bold (+D -A) Sturdy
EVs: HP - 252, D - 80, SD - 176
Lv50 stats: 127, 13, 280, 19, 274, 15
-Power Split
-Rest
-Struggle Bug
-Stealth Rock
Ferrothorn @Leftovers
Relaxed (+D -S) Iron Barbs
EVs: HP - 252, D - 104, SD - 152
Lv50 stats: 181, 107, 178, 63, 153, 22
-Gyro Ball
-Curse
-Leech Seed
-Substitute
Salamence @Lum
Jolly (+S -SA) Intimidate
EVs: HP - 4, A - 252, S - 252
Lv50 stats: 166, 186, 100, 103, 96, 166
-Outrage
-Earthquake
-Substitute
-Dragon Dance
Note that I don't remember all the defense EV distributions exactly so they're approximate. They're also not RNGd, so the IVs are not all perfect, but good enough.
Power Split Shuckle is a boss.
It's like having a memento that doesn't make you faint, and isn't bypassed by crits.
Struggle bug lowers SpA and Stealth Rock gets rid of Sashes and Sturdy for the sweepers.
Ferrothorn is very versatile and with a small amount of support from Shuckle it can set up on almost anyone.
I was originally worried about its weaknesses once it's set up: The second poke it faces can often get rid of the sub which leaves the third free to KO with any SpA Fire move, or Physical Crit, but surprisingly this actually never happened in the 250 streak.
Stealth Rock really helps, it means you're sure to 1HKO all Fire types as well as anyone else aside from really bulky waters or steels.
The other thing that helps is that the AI will usually have only 1 good counter for Ferrothorn and they'll send it out second which means all it can do is break the sub.
Salamence is my addition to the Shuckle/Ferro combo, (which I think was first used by Pikiwyn, so congrats to that guy's brain). Intimidate is fantastic. Ferrothorn draws a lot of ground, fighting and fire moves which Salamence can switch into, lowering the attack.
The rest is just the classic trick/scarf sweeper set, which can also be useful for getting rid of a bad lead such as Magmortar with taunt.
I was originally thinking about using Multiscale Dragonite when I get one, but now I think Intimidate is too integral to the team, especially with stuff like dealing with physical taunters or when Shuckle gets flinched to death.
So it's a versatile team and it generally takes more than a couple of things going wrong to end the streak.
Flinching, confusion, and to some extent crits are all pretty annoying but generally not too much of a problem.
How I lost:
Battle 251,
Black Belt sends out Escavalier,
It uses Swagger and Shuckle hurts itself, :(
Iron Head does about 70% and Shuckle hurts itself, >:(
I switch to Ferro, Iron Head does about 10%
I switch to Mence, Intimidate, Megahorn does about 15%
I switch back and forth getting 4 Intimidates and Mence is down to about 40% health.
I switch to Shuckle, iron head does about 10%, Shuckle has 20% remaining.
Swagger, Shuckle hurts itself, >>:(
Megahorn (about 8% remaining), Shuckle hurts itself. >>>:(
Megahorn KOs
I send in Salamence for Intimidate #5, then switch to Ferrothorn who takes a nothing Iron Head.
Swagger, Ferrothorn hurts itself (Ferrothorn is at about 95%)
Megahorn, Critical Hit, KOs
This might actually be the first time in the run that Ferrothorn is knocked out, how crazy is that?
Salamence goes in, intimidate #6,
Sub, Iron Head
Dragon Dance, Iron Head, Sub breaks (Mence has about 20% health)
EQ KOs Escavalier,
praying for some luck,
Life Orb Medicham comes in and Fake Out KOs.
gg
If any of the 5 (out of 5) times I was confused, I could actually get a move off, it would've all been pretty much fine, and it still took a very untimely crit to end the team, so I don't think the loss was because of any misplay or problems with the team, so that's all good.
Plus 250 is a great (and very square) streak and I definitely had some hax coming to me.
Thanks to Pikiwyn for the team idea and to everyone who comes up with and shares their strategies.
Weird how my two records are now 248 and 250.