Viability Tiers — Reweighted for Aggression

Spine: the canonical community Viability Ranking (VR), presented as a recent snapshot, then reweighted for one job — applying pressure, breaking the SkarmBliss backbone, and sweeping. The plain-letter VR ranks how good a mon is at everything; this chapter re-sorts it by how much it helps you win fast. Bold names link to a full threat dossier. ADV adds no extra battle mechanics — no Megas, no Z-Moves, no Terastallization. Coming from a modern gen? The phys/special split is by TYPE, and Steel resists Ghost AND Dark. Read Mechanics Fundamentals first if any of that is new.

How to read this table

ADV is a slow, attrition-heavy, prediction-heavy tier. The defensive backbone — Skarmory + Blissey + a bulky Water + Snorlax — recovers all day, so the canonical VR is built around who survives that grind. Aggressive offense does not. Your shopping list is different: trappers that delete a single wall on demand, breakers that overload a defensive core in one switch, Explosion users that trade their life for a free turn, and fast setup sweepers that convert that turn into a game.

So this chapter does two passes. First the VR snapshot — the maintained community list, by letter. Then the reweighting — who rises and who falls once your only question is “does this help me pressure, break, or sweep?” The walls don’t disappear from the conversation; they become the obstacle you build against, which is exactly why they still matter.

VR is a living snapshot. The Smogon OP shifts every tournament cycle, and individual mons drift between letters as the meta moves. Treat letters as “as of the most recent update,” not gospel. Finer intra-tier orderings exist in community discussion, but the plain-letter OP is the canonical maintained list, and it is what this page mirrors.

Ubers are not here. Latias, Latios, and Wobbuffet are Uber-tier and banned from ADV OU — the Showdown gen3ou validator rejects all three, and the Soul Dew ban does not promote the Lati twins into OU. They are not entries in any table below, and you will never see them on a legal team. The full OU banlist is the Gen-3 Uber tier (Mewtwo, Mew, Lugia, Ho-Oh, Kyogre, Groudon, Rayquaza, Deoxys-all-formes, Latias, Latios, Wobbuffet, Wynaut), plus the Soul Dew item.

VR Snapshot — the canonical list, by letter

S Rank — the pillars

A Rank

B Rank

C Rank

D / Niche

These two carry full dossiers because they are aggressive-offense staples, not because their plain VR letter is high — the clearest example of why the reweighting below matters more to you than the letter.

The Reweighting — value through the aggressive lens

The VR letter answers “how good is this mon in the abstract?” You need the answer to “how much does this mon help me pressure, break a wall, or sweep?” Those are different questions, and the gap between them is where games are won. Here is how the pool re-sorts.

Risers — worth more to you than their letter

Trappers go up the most. A wall that recovers every turn is unbreakable by fair means; the answer is to remove it from the game. That makes the trappers the highest-leverage picks on aggressive offense regardless of their VR.

• Magneton (VR B → top-shelf for offense). Magnet Pull traps Steels and KOs them in place: Magnet-boosted Thunderbolt or Hidden Power Fire (2× on Skarmory’s Steel/Flying) deletes the wall that stops your entire physical game. It also pins Forretress, opposing Metagross/Jirachi, and other Magneton. Note the limit — Magneton is Electric/Steel and so takes 4× from Ground (Earthquake from a switch-in or Dugtrio is the punish), and a Swampert simply walks in Electric-immune via its Ground typing.
• Dugtrio (VR A, but its offense value runs even higher). Arena Trap pins any grounded mon and EQs it: weakened Tyranitar, Snorlax, Metagross, Jirachi, Raikou, and — with Beat Up — Blissey. Base 120 Speed means it also revenge-kills most of the unboosted field — everything short of the base-130s (Aerodactyl and Jolteon). Its blind spot is hard-coded: Flying-types and Levitate escape entirely — Skarmory, Zapdos, Salamence, Aerodactyl, Gengar, Claydol, Flygon all walk out (Ground does 0× to Flying, and Levitate is a free Ground immunity).

Explosion users go up. Boom halves the target’s Defense in Gen 3, so it is far stronger than in later gens — a one-time payment that removes a wall and hands the next mon a free setup turn. Metagross (CB Explosion has a high chance to OHKO Skarmory), Gengar, Snorlax, Cloyster, and Claydol are all worth more to you for this single move than their walling or pivoting value suggests.

Fast setup sweepers and breakers go up. With no Choice Scarf, speed is fixed unless you boost it, so the mons that make their own speed are your win conditions. DD Tyranitar (the best sweeper in the tier, no hard counters), DD Salamence (+1 outspeeds the entire unboosted field), Suicune Calm Mind, DD Gyarados, Agility Metagross, and Sub+Salac Heracross (gains speed as it’s chipped — the closest thing the tier has to a Scarf) all jump.

The mixed/wallbreaker nukes go up. MixMence overloads the SkarmBliss core in one switch — Fire Blast roasts Skarmory (2×) while HP Grass 2HKOs Swampert (4× on its Water/Ground). CB Medicham (Pure Power doubles Attack — VR C, but a top-tier wall-remover) and CB Heracross just delete fat. These rise hardest when paired with a trapper: trap the check, then click the nuke.

Leads and revenge killers go up. Aerodactyl (base 130, immune to Spikes via Flying, Rock Head recoilless Double-Edge) sets the tempo turn 1 and revenge-kills boosted threats — it keeps you on the front foot, which is the whole game plan. Jolteon (base 130) is immediate speed control out of the box. Starmie is the rare spinner that revenge-kills and pressures while spinning, so hazard control doesn’t cost you a turn of tempo.

Fallers — worth less to you than their letter

Pure defensive walls fall — but only as teammates. You don’t run Swampert, Milotic, or a defensive Blissey on relentless offense; they bleed the momentum your game plan is built on. Their VR letters are earned on balance and stall, archetypes this guide isn’t. The catch: every one of them is still an A/B/C-rank obstacle you must plan to break, so they stay loud in the conversation — just on the other side of the field.

• Skarmory (S) — the #1 wall to physical offense; Steel/Flying takes 0× from Ground and walls nearly every physical attacker, so it is pure obstacle to you. Plan: trap it (Magneton), Explode on it (CB Metagross), or roast it (MixMence Fire Blast, 2×).
• Blissey (A) — the universal special wall; immune to the Ghost-type Shadow Ball of Gengar (Ghost does 0× to Normal) — but not its Explosion, which is a Normal-type move and hits Blissey at full neutral damage but folds to Fighting (2×) and to physical CB pressure (poor Defense). Plan: trap it (Dugtrio Beat Up + EQ), Explode on it, or overload it with a mixed breaker.
• Swampert (A) / Milotic (C) — bulky Waters that Roar/out-stall your sweepers. Plan: HP Grass (4× on Swampert), Toxic + Spikes chip, or trap the support around them.
• Snorlax (B) — the special wall your offense must overwhelm; it’s also a breaker you can wield (Self-Destruct + Curse). When it’s the enemy: Dugtrio trap, Focus Punch, or Heracross’s Fighting (2×).

The takeaway: on an aggressive build, a wall’s value is inverted. The better it walls, the more of your slots must be pointed at removing it — so it climbs your threat list precisely as it falls off your team list.

Putting it together — the aggressive priority order

If you re-sort the whole pool by “how directly does this advance pressure-break-sweep,” the practical tiers look like this:

1. Build-around engines: Tyranitar, Salamence, Metagross, Dugtrio, Aerodactyl, Magneton.
2. Sweepers, breakers, cleaners: Heracross, Gengar, Starmie, Charizard, Jolteon, Medicham, Breloom, Gyarados, Jirachi, Suicune, Zapdos.
3. Walls you break (the obstacle list): Snorlax, Skarmory, Blissey, plus Swampert and Milotic as untiered obstacles.

That ordering is what Building Aggressive Offense and Common Cores act on, and every entry above opens onto its threat dossier where you’ll find the corrected Gen-3-legal sets, calcs, and the run-it-or-break-it plan. For the precise effectiveness math behind every multiplier on this page, see the Mechanics & Calc Reference.