So, I just happened to discover Seismotoad couldn't learn Swords Dance after training my entire team. I thought maybe he'd turn out alright, but his damage is quite pathetic, and I'm not sure what I should replace him with...
Current Team: Politoad Lead/ Seismotoad Second Lead/ Dragonite Revenge Killer/ Raikou Revenge Killer + Backup Rain Dancer
Kabutops- Jolly- @Leftovers
Swift Swim- 252 Atk/ 148 Spe/ 72 Hp/ 30 SpD
-Swords Dance
-Aqua Jet/Return/X-Scissor
-Waterfall
-Rock Slide/ Stone Edge
Useless using Superpower on a Swords Dance set, as it undoes his SD stat boosts.
Aqua Jet can be used to pick off pokemon that are carrying a priority you fear (Mach Punch/Vaccuum Wave comes to mind), though Return can be used to get some more coverage. X-Scissor in case you fear Grass types, though a lot of Grass types have a secondary type neutralizing the Bug weakness, such as Grass/Steel, Grass/Flying, Grass/Poison, and Grass/Bug, the latter two being very common typing.
My first choice and the one I like the most. He has enough speed so that I can give him some bulk, as 148 doubled outspeeds the entire Subway. The only problem is he adds a few weaknesses such as another Electric weakness as well as a Ground and Fighting weakness. All of this I have the ability to counter, but it can cause trouble. Stone Edge is good for power, but the decrease in accuracy might not be worth the damage...
Another idea I had is Kingdra:
Kingdra- Adamant- Life Orb
Swift Swim- 252 Hp/ 252 Atk/ 4 SpD
-Dragon Dance
-Outrage
-Waterfall
-Return/Rest/Substitute
With the exception of Ice types, which he doesn't fear anyway, Iron Head provides useless coverage (with the exception of a better flinching rate than Waterfall, 30% > 10% IIRC).
Use Return for more coverage, Rest to heal off Life Orb damage, or Sub to better set up DD (though you're asking for trouble with that combo)
If you run Rest, you could use a Chesto Berry. DD until low on health, wake up instantly, and start outspeeding and smashing pokes with boosted Waterfall.
What isn't already outsped by Kingdra right off the bat is outsped after a single Dragon Dance. Problem is, there are pokemon that can wall Kingdra due to a lack of physical coverage, but at least Waterfall will help Outrages lack of damage vs Steel Types. Iron Head was just thrown in there because I have no clue what else could even be used.
1. Waterfall does more damage to Steel types than Iron Head will ever do.
2. The only pokemon Kingdra cannot hit for at least neutral damage with those two moves are Ferrothorn (who he shouldn't even TRY to take down, unless in desperation), and Empoleon, which cannot hit Kingdra back SE, and Kingdra resists both of its STAB moves (Water 1/4x, Steel 1/2x)
DW Armaldo would be my last idea, but he is weak to Water which Rain boosts, not the best idea.
Armaldo isn't weak to Water, he takes neutral damage from it (2x Rock weakness and 1/2x Water resistance cancel each other out, making it 1x, normal damage)