Although I said a few months ago that I was done with Subway, I have just made a liar out of myself. It was worth it though.
Battle Subway Super Multi Streak (with friend): 162 wins
I did this solo with 2 3DSs on Black 2 and Black. It took about 2 weeks or so, although it might have been quicker if I wasn't doing other things at the same time.
Team 1
Tornadus @ Flying Gem
Jolly
ivs: 31/31/31/x/31/31
evs: 4/252/0/0/0/252
stats: 155/167/90/x/100/179
Prankster
Acrobatics
Taunt
Tailwind
Substitute
Swampert @ Life Orb
Adamant
ivs: 31/31/31/x/31/31
evs: 4/252/0/0/0/252
stats: 176/178/110/x/110/112
Torrent
Earthquake
Waterfall
Ice Punch
Protect
Team 2
Infernape @ Focus Sash
Hasty
ivs: 31/31/31/31/31/31
evs: 0/252/0/4/0/252
stats: 152/156/81/124/91/176
Blaze
Fake Out
Close Combat
Flamethrower
Protect
Hydreigon @ Life Orb
Timid
ivs: 31/x/31/31/31/31
evs: 4/0/0/252/0/252
stats: 168/x/110/177/110/165
Levitate
Dragon Pulse
Dark Pulse
Flamethrower
Protect
This is basically the same team as my best Doubles Streak
here. There is only 1 difference: Swampert now holds a Life Orb instead of a Muscle Band. Life Orb has always been my preferred item for Swampert, and now I can actually use it because I don't have item clause getting in the way. If you want to read about the team then check the link.
I've actually been thinking about doing a Multi streak for a while. I was trying to think of an interesting team to try it out but I got nowhere with any of my ideas. In the end, I said "screw it" and just went with the team I used for Doubles. It ended up working just as well. Normally I would be a little bit worried about simply transferring a Doubles team to Multi because you aren't able to choose which Pokémon you want to switch in when you want to switch out (i.e. I can't switch Swampert in for Infernape, and I can't switch Hydreigon in for Tornadus, because they aren't on the same game card). In this case it didn't matter. Normally that is how I would want to switch anyway. Swampert has good synergy with Tornadus thanks to its Rock resistance and Electric immunity. The lack of Ice resistance is a shame but it's not a huge problem. Tornadus can also switch in to Grass attacks for Swampert, but situations where I would need to make this switch are rare (I think there was 1 instance of this in the whole streak, against a Virizion). I don't think I need to say much about how well Infernape and Hydreigon pair up since that has been well documented in this thread. Very occasionally I would be left wanting to get Tornadus to switch in for Infernape if Hydreigon died so I wouldn't have to worry about Swampert hitting it with Earthquake, but other than that there aren't any problems with the set up.
I play this team basically the same way in Multi as I did in Doubles. There are a few differences to consider though. Because I face 2 separate Trainers with 2 Pokémon instead of 1 Trainer with 4, I'm sometimes able to gang up on 1 Trainer so I have more Pokémon on my side then they have on theirs. This isn't a new insight or anything (anyone who has played Multi will tell you this) but it's noted regardless. Furthermore, facing 2 different Trainers means that I rarely have to face a full team of 4 from a particular trainer type. For example, I rare have to face 4 legendary Pokémon on the 1 team because this will usually only occur if I just happen to generate 2 legendary Trainers in the one battle (it happened once in the whole streak). Therefore, I only have to face 2 legendary Pokémon and 2 other Pokémon most of the time so it usually won't be as difficult.
The trickiest battles, depending on what Pokémon I actually face, tend to be those where I can't determine the Pokémon I'm facing straight away (think Bikers Petro/Phillipo, legendary trainers, etc.). This team can answer pretty much any threat most of the time but if I don't know how I'm suppose to answer it then the battle will be tougher. This actually contributed to me losing in my final battle. Had I known the specific set of one of the backups, I would have played differently and it would have been fine I think.
I didn't save the final battle, but it was a mix of hax and misplaying. I should say that I don't run damage calculations when I play since I'm lazy, but had I done I would have played the final turn VERY differently! I lost to Biker Petro (all 4 sets of a mixture of offensive and defensive Pokémon) and Harlequin Athos (Trick Room). Petro sends out Salamence and Athos sends out Slowbro 4. Not a great match-up from the start (Intimidate sucks) but I'm not particularly worried yet. In my experience, Trick Room Pokémon will always set up Trick Room in Doubles if both of the Pokémon on their side are slower than both of the Pokémon on my side, even if it can kill one of my Pokémon (note that most of the Trick Room Pokémon I face are Psychic-types and can OHKO Infernape, so the fact that they have always gone for Trick Room instead is why I think this way). Therefore, I decide to Taunt Slowbro to block it, while using Fake Out on Salamence.
However, this Slowbro was special. It used Surf instead, which dealt a critical hit to BOTH Tornadus and Infernape. I suspect that the game knew that this was going to happen, because it goes against everything I have experience with Trick Room Pokémon. I can't really prove that though, and nothing I can say will change what happened. On the plus side, Salamence took Fake Out and Surf damage, so I decide to hit it with Acrobatics. However, I'm not sure what to do with Infernape. I could switch out or use Protect to prevent myself from dying, but I was worried that Slowbro would use Blizzard. Therefore, I decide to use Flamethrower. Salamence dies to Acrobatics and Slowbro takes a Blaze-boosted Flamethrower. Slowbro kills Infernape with Psychic, so I send Hydreigon in, hoping to kill Slowbro next turn...
...except that Petro also sends out a Hydreigon. I don't know which Hydreigon set I'm facing, and I know that some of them run max speed like mine. Not wanting to risk the Speed tie, I Protect with Hydreigon and use Tailwind with Tornadus to remove the risk. Petro's Hydreigon uses Dragon Pulse against Protect, which means it's Hydreigon 1. This Hydreigon has a Rash nature which means that had nothing to worry about in the first place. As I said before, not knowing the Pokémon straight away is what threatens me the most. Slowbro uses Blizzard to kill Tornadus, and in goes Swampert.
I use Dark Pulse to finally kill Slowbro, Ice Punch falls short of a OHKO on Hydreigon, and my Hydreigon dies to one Dragon Pulse. Athos sends in Iron Ball Seismitoad. I kill Hydreigon with Ice Punch while Seismitoad puts me in the yellow with Earthquake (i.e. Earthquake will kill me next turn).
This is where I really messed up. I didn't think Earthquake would OHKO it, so I decide to use Waterfall to try for a flinch. Waterfall leave Seismitoad with a sliver of HP, and I lose.
Had I just used Earthquake, I would have won. I could have played Infernape better instead of letting it die so easily, and I'm not sure if killing Slowbro instead of Hydreigon was the best idea either (maybe it would has survived an unSTABed split-damaging Blizzard?). So yeah, this could have been avoided with better plays, but I'm happy with the streak I got.
Snorlax @ Leftovers
Brave - Thick Fat
IV's: 31-31-31-31-31-0
EV's: 252 HP - 36 Attack - 76 Defense - 148 Special Defense
Curse - Body Slam - Crunch - Fire Punch
Wouldn't Return or Double-Edge be better in this case? I don't think the paralysis would be helpful under Trick Room!
Good job on the streak. 82 is pretty good for a Trick Room team.