So I think about the Subway a lot, but I've never really put together a team to have a go with. I had an idea today, though: Slowbro, Volcarona, and Lucario
. Bear with me, my knowledge of the Subway is fairly limited and I'm human, so it's probably not perfect.
Slowbro @ Leftovers (Broseidon)
The idea is to tank physical attackers with Scald and Slack Off. Against Special attackers, he wants to T-Wave and switch out. Preferably with enough HP to regenerate back to full so that he's useful later on if things go awry.
Alternatively, this slot can go to Rotom-W because it has the WoW/T-Wave combination. I'm leaning more toward Bro at this point though because of more reliable recovery and Regenerator, which means Slowbro can be just effective late game as he can a lead.
Flamethrower is filler. I figure it would be a good answer to Taunt Whimsicott (which I think is present). It's also useful for physical tank grass-types that Volcarona might have trouble with and I don't want to waste Lucario on.
Volcarona @ Something or other (Volcswagen)
I really like QDance. It raises bulk and speed, which are integral to successful sweeping. With the opposing Pokemon T-Waved Volcarona should be able to control the battle with a combination of boosting Sp. Def. and recovering HP. I'm fairly certain that neutral weather is far more common in the Subway than in, say, OU, so Morning Sun should never be a liability.
Volcarona and Slowbro don't compliment
each other per se, but they don't share any weaknesses. They're either neutral or resist the other's weaknesses, which I find is acceptable.
Lucario @ Something or other (Picard)
-Probably Ice Punch
Lucario fills in all the holes: nothing that hits it for super effective makes it past Slowbro, and likewise anything that hits Bro for the same is resisted by Lucario. Moreover, it's a 4x Stone Edge resistance for Volcarona and can provide for an early sweep if it switches in on a Dark-type move aimed at Slowbro (dance, baby. dance, baby. I hear +3 Atk Extremespeed is pretty good.) It's also a handy resist for Bullet Punch, Sucker Punch, Extremespeed, and Quick Attack (Mach Punch and Vacuum Wave being resisted by Slowbro), which means the team has a strength against priority.
Which is good, because Volcarona dies to almost all of those.
Another problem Volcarona may befall is Sturdy/Slash. Extremespeed allows Lucario to very easily revenge kill these Pokemon to prevent loss of momentum.
I'm wondering if Volcarona should carry WoW instead of Bug Buzz. If the point is to +6 all the stats then is coverage even an issue? You should be able to easily brute force through just about anything at that level. Maybe not, though. Maybe not Latias, Reuniclus, or 4x Fire resists. At the same time, having that more reliable burn would make it easier for Lucario to clean up after Volcarona has failed.
So that's my idea. I've given it a fair amount of thought so far but I feel like I don't want to try it until I've let other more experienced people take a look. Just to make sure I didn't miss anything very important.