I just got a streak of 94 in the Super Double Subway. This was my first try with this team and I lost due to a combination of misplay and an untimely crit. I'm gonna try it again later and I'm confident I can get a lot further when I'm a bit less tired.

Politoed (M) "Theodor"
Item: Choice Specs
Ability: Drizzle
Nature: Modest
IVs: 31/xx/31/30/31/31
EVs: HP 252, Def 4, Sp. Att 244, Sp. Def 4, Spd 4
Stats: 197/xx/96/154/121/91
- Surf
- Ice Beam
- Hidden Power Electric
- Psychic
Pretty obvious. I only use something besides Surf on extremely rare occasions when I'm tricked another item and the situation requires me to do so.

Toxicroak (M) "Phobos"
Item: Focus Sash
Ability: Dry Skin
Nature: Adamant
IVs: 31/31/31/xx/31/31
EVs: HP 4, Att 252, Spd 252
Stats: 159/173/85/xx/85/137
- Fake Out
- Sucker Punch
- Drain Punch
- Bulk Up
Pretty standard I suppose. Bulk Up over Protect because of the oppponents this team attracts tend to give me quite a lot of chances to use it, and it's an efficient way to for Toxicroak to deal extra damage with Sucker Punch when there's nothing else left for him to do.
Then for the back row. I've tried a lot of frail rain-dependant stuff on my previous double line runs like Kingdra, Starmie and Kabutops for example, and it seems that they just don't cut it, for me at least. That's why I went for something more solid this time.

Cradily (F) "Skylla"
Item: Leftovers
Ability: Storm Drain
Nature Bold
IVs: 31/xx/31/31/31/30
EVs: HP 252, Def 116, Sp. Def 132, Spd 4
Stats: 193/xx/145/101/144/64
- Energy Ball
- AncientPower
- Hidden Power Ice
- Recover
This Cradily is something special I wanted to try out. It has great defenses and it gets plenty of Storm Drain boosts from the others. It can just sit there and take hits and wait for the battle to be over, or just as well take an active part.

Milotic (M) "Loki"
Item: Life Orb
Ability: Marvel Scale
Nature: Timid
IVs: 31/xx/31/30/31/31
EVs: HP 4, Def 4, Sp. Att 248, Spd 252
Stats: HP 171/xx/100/151/145/146
- Surf
- Ice Beam
- Hidden Power Electric
- Recover
This team is pretty solid overall and I didn't notice any apparent weaknesses. I think everyone compliments each other very well as Politoed and Milotic provide boosts and healing for the other two, while Toxicroak and Cradily serve as priority, physical offense and defenses. Feel free to contribute your thoughts.
How I lost:
Milotic and Cradily were out against Salamence and Kingdra. Kingdra got a crit on Cradily with Draco Meteor when it was already at -2 or -4 and then Salamence proceeded to knock it out with Outrage. I was counting on surviving the turn so I Surfed for the boost instead of Ice Beaming Salamence, which cost me the match.
I'm gonna try again with these guys too, but I'd also like to come up with a decent back row for this amazing thing:

Item: Leftovers
Ability: Water Absorb
Nature: Careful
IVs: 31/31/31/xx/31/31
EVs: HP 252, Sp. Def 252, Spd 4
Stats: 237/105/100/xx/161/81
- Curse
- Ice Shard
- Waterfall
- Toxic / Rain Dance
I've played a couple of hundred battles with him and he's absolutely amazing. He obviously leads with Politoed to start boosting as early as possible, while Politoed constantly heals him with Surfs. If he gets up even a single Curse, he won't die. My problem is that I can't seem to find a good back row to support these two and clean up after them. The problem is that at least one of the two should be able to support Lapras with fast Surfs. I've tried so many different things I can't even think of what to try next. I wanna get my big streak with this Lapras and I know I can. I'd appreciate any suggestions you could offer.