Exploud for B-
IDK how Exploud avoided getting ranked. I have to attribute that to an oversight, because after having used it I can say that it is amazing. Specs Boomburst does giant damage to most everything, even some bulky 2x resistant Pokes like Scizor. It also has great coverage in Ice Beam, Overheat, and Focus Blast. Its bulk is fairly disappointing, but w/ proper investment it can survive a lot of powerful attacks like 252 Atk Mega Kangaskhan's Double-Edge and 252 Atk CB Garchomp's Outrage. Speed is another issue, but even though base 68 isn't very good, it's a nice benchmark, outspeeding base 65s like Scizor that don't invest enough in spe. Paralysis, TR, or Tailwind support all take care of the spe issue as well. Lastly there's Exploud's ridiculously good ability, Scrappy. BB is an extremely good move, but it'd still be useless against ghost types w/o Scrappy. W/ it, though, Exploud can 1v1 Mega Gengar, and probably Mega Sableye as well if it doesn't have any SpD boosts.
Here are some calcs:
252 SpA Mega Gengar Sludge Bomb vs. 68 HP / 0 SpD Exploud: 121-144 (64.3 - 76.5%) -- guaranteed 2HKO
204+ SpA Choice Specs Exploud Boomburst vs. 0 HP / 0 SpD Mega Gengar: 154-183 (114 - 135.5%) -- guaranteed OHKO
204+ SpA Choice Specs Exploud Boomburst vs. 252 HP / 0 SpD Mega Gengar: 154-183 (92.2 - 109.5%) -- 56.3% chance to OHKO
Vs Gengar Exploud normally wins, though bulky variants have a chance to avoid the OHKO and 2HKO in return.
252 Atk Choice Band Garchomp Outrage vs. 68 HP / 236 Def Exploud: 163-193 (86.7 - 102.6%) -- 18.8% chance to OHKO
252 Atk Choice Band Garchomp Rock Slide vs. 68 HP / 236 Def Exploud: 68-81 (36.1 - 43%) -- guaranteed 3HKO
204+ SpA Choice Specs Exploud Boomburst vs. 4 HP / 0 SpD Garchomp: 169-201 (91.8 - 109.2%) -- 56.3% chance to OHKO
The Exploud set I use, which is what I'm calciing w/, is only rarely KOd by CB Chomp's Outrage, w/ anything weaker having no chance. The 3rd calc is to show you are generally ok vs Chomp even if you're locked into BB and can't use Ice Beam. Exploud does have to watch out for Sash Chomp, however.
252+ Atk Landorus-T Superpower vs. 68 HP / 236 Def Exploud: 172-204 (91.4 - 108.5%) -- 50% chance to OHKO
252+ Atk Landorus-T Earthquake vs. 68 HP / 236 Def Exploud: 109-129 (57.9 - 68.6%) -- guaranteed 2HKO
252+ Atk Landorus-T Explosion vs. 68 HP / 236 Def Exploud: 180-212 (95.7 - 112.7%) -- 75% chance to OHKO
204+ SpA Choice Specs Exploud Boomburst vs. 4 HP / 0 SpD Landorus-T: 178-210 (107.8 - 127.2%) -- guaranteed OHKO
Simple 252 Atk/252 Spe Scarf Landog. Exploud takes it to town every time unless it has one of two very niche moves, and neither are sure things vs Exploud.
252 Atk Parental Bond Mega Kangaskhan Double-Edge vs. 68 HP / 236 Def Exploud: 159-189 (84.5 - 100.5%) -- 6.3% chance to OHKO
204+ SpA Choice Specs Exploud Focus Blast vs. 4 HP / 0 SpD Mega Kangaskhan: 170-202 (93.9 - 111.6%) -- 62.5% chance to OHKO
Big momma's DE almost never KOs, while Focus Blast or BB will take her out after recoil. Secret Power variants are more threatening as they don't take recoil, may cause you paralysis, and are likely to have more bulk and/or power, meaning they can probably take a FB-if it even hits. Still not too shabby.
204+ SpA Choice Specs Exploud Boomburst vs. 44 HP / 0 SpD Talonflame: 199-235 (125.1 - 147.7%) -- guaranteed OHKO
244+ Atk Choice Band Talonflame Brave Bird vs. 68 HP / 236 Def Exploud: 130-154 (69.1 - 81.9%) -- guaranteed 2HKO
204+ SpA Choice Specs Exploud Boomburst vs. 172 HP / 0 SpD Talonflame: 199-235 (113.7 - 134.2%) -- guaranteed OHKO
0 Atk Talonflame Brave Bird vs. 68 HP / 236 Def Exploud: 61-73 (32.4 - 38.8%) -- 99.4% chance to 3HKO
Exploud beats any Talonflame if it hasn't taken much prior damage or is locked into an unfavorable attack. No variant, even NG fighting, can KO you from full health, while even bulky variants are KOd back. In fact, Exploud prefers bulky Talon as it's still KOd but does much less damage.
204+ SpA Choice Specs Exploud Boomburst vs. 0 HP / 0 SpD Mega Salamence: 162-192 (95.2 - 112.9%) -- 68.8% chance to OHKO
252 Atk Aerilate Mega Salamence Double-Edge vs. 68 HP / 236 Def Exploud: 153-181 (81.3 - 96.2%) -- guaranteed 2HKO
Mega Salamence is also ruined lacking a DD. W/ recoil you don't even need Ice Beam for the KO.
204+ SpA Choice Specs Exploud Boomburst vs. 252 HP / 4 SpD Cresselia: 118-139 (51.9 - 61.2%) -- guaranteed 2HKO
Cress isn't as relevant as most of the other things, but 2HKOing her is quite a feat, and you really only have to fear paralysis from her.
204+ SpA Choice Specs Exploud Boomburst vs. 0 HP / 0 SpD Thundurus: 178-210 (115.5 - 136.3%) -- guaranteed OHKO
204+ SpA Choice Specs Exploud Ice Beam vs. 0 HP / 0 SpD Thundurus: 154-182 (100 - 118.1%) -- guaranteed OHKO
Offensive Thundy will lose if it lacks a NP boost.
0 Atk Aegislash-Blade Sacred Sword vs. 68 HP / 236 Def Exploud: 102-122 (54.2 - 64.8%) -- guaranteed 2HKO
204+ SpA Choice Specs Exploud Overheat vs. 252 HP / 4 SpD Aegislash-Shield: 130-154 (77.8 - 92.2%) -- guaranteed 2HKO
204+ SpA Choice Specs Exploud Focus Blast vs. 252 HP / 4 SpD Aegislash-Shield: 120-142 (71.8 - 85%) -- guaranteed 2HKO
204+ SpA Choice Specs Exploud Boomburst vs. 252 HP / 4 SpD Aegislash-Shield: 52-62 (31.1 - 37.1%) -- 78.1% chance to 3HKO
Aegi needs +2 Atk to KO, while an immunity to Shadow Sneak means Exploud can always 2HKO unless it misses or something like that. The likelihood of a 3HKO on Aegi w/ BB means it can't comfortably switch in on anything but Ice Beam.
I could do more calcs, but hopefully that gives a general idea of how good Exploud is. Even though I've done several battles w/ it, I haven't saved any of them, so I don't have any replays atm.