7-Star Unrivaled Hydreigon Tera Raid in Pokémon Scarlet and Violet: Poison Tera Type, Boss Script, and Best Solo Blissey Build
The black Tera Raid crystals across Paldea have welcomed back a ferocious three-headed dragon just in time for Halloween in Pokémon Scarlet and Pokémon Violet. Running from Friday, October 30, 2026, at 00:00 UTC through Thursday, November 5, 2026, at 23:59 UTC, Hydreigon the Unrivaled headlines the latest 7-Star Tera Raid Battle event. Packing a Poison Tera Type at Level 100 alongside a tricky combination of special attacks and stat boosts, this boss punishes unprepared challengers right out of the gate. Here is the full breakdown of Hydreigon's raid script and the foolproof solo Blissey build to defeat it without relying on online teammates.
Event Schedule, Access, and 7-Star Unrivaled Hydreigon Profile
Unlike two-part 7-Star raid events that split across two weekends with companion 5-Star Blissey dens, this Halloween return runs as a single continuous week-long block ending November 5 at 23:59 UTC. To spawn the black Poison-type crystal on your Paldea map, make sure to connect online or refresh your game data via Poké Portal > Mystery Gift > Check Poké Portal News, right alongside this week's Mystery Gift Spewpa distribution and 16-pattern Vivillon event rewards.
- Pokémon: Hydreigon (Level 100, 6 flawless 31 IVs)
- Exclusive Ribbon: Mightiest Mark (catchable once per save data)
- Tera Type: Poison
- Ability: Levitate
- Nature: Modest (+Special Attack, -Attack)
The central trap of this 7-Star raid lies in how Hydreigon's Tera Type interacts with its signature ability. Normally, a Poison-type Pokémon is weak to both Ground and Psychic moves. However, because Hydreigon retains Levitate, it is completely immune to Ground-type attacks like Earthquake and Earth Power unless you alter its ability or set up Gravity. That leaves Psychic-type attacks as its only direct weakness from turn one.
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Hydreigon Moveset and Chronological Boss Script
Built purely as a special attacker thanks to its Modest nature, Hydreigon carries four active moves designed to hit neutral targets hard while punishing Steel- and Rock-types that try to wall its Poison STAB:
- Tera Blast (Poison-type, Special, 80 base power with Tera STAB)
- Dark Pulse (Dark-type, Special, 80 base power with STAB and a 20% flinch chance)
- Dragon Pulse (Dragon-type, Special, 85 base power with STAB)
- Earth Power (Ground-type, Special, 90 base power with a 10% chance to lower Special Defense)
According to raid data documented by Serebii, Hydreigon follows a strict HP and timer script that dictates when you should hold or spend your stat-boosting moves:
- Turn 0 (Immediate Opening): Hydreigon opens the battle with Snarl, dealing spread damage and dropping every player's Special Attack by one stage (-1).
- At 85% HP or 85% Time Remaining: It puts up its Tera Shield very early and immediately uses Dragon Dance.
- At 80% Time Remaining: It wipes all player stat boosts and nullifies your party's abilities for one turn.
- At 70% HP Remaining: It clears its own negative stat changes and casts Nasty Plot (+2 Special Attack).
- At 55% HP Remaining: It fires off a second Nasty Plot, pushing its Special Attack to +4 if left unchecked.
Best Foolproof Solo Build: Psychic Tera Blissey
Because Hydreigon lacks a single physical attack in its moveset, bringing a special wall turns this 7-Star encounter into a stress-free solo clear. Widely recommended across the r/PokemonScarletViolet community, Blissey boasts an astronomical 255 base HP and 135 base Special Defense. Even after Hydreigon stacks two Nasty Plots, its attacks barely scratch Blissey's health bar.
- Pokémon: Blissey (Level 100)
- Tera Type: Psychic
- Ability: Natural Cure or Serene Grace
- Held Item: Covert Cloak (essential to block the 20% flinch chance from Dark Pulse and Special Defense drops from Earth Power)
- Nature: Calm (+Special Defense, -Attack) or Modest (+Special Attack, -Attack)
- EV Spread: 252 Special Defense / 252 Special Attack / 4 HP
- Moveset:
- Calm Mind: Raises Special Attack and Special Defense by one stage each turn.
- Stored Power: Psychic-type attack that gains +20 base power for every positive stat stage on the user.
- Soft-Boiled: Instantly restores 50% of Blissey's maximum HP.
- Light Screen: Halves incoming special damage for five turns.
Turn-by-Turn Solo Strategy With Blissey
- Turns 1 to 3 (Wait Out the 80% Stat Wipe): Set up Light Screen on Turn 1, then attack twice with Stored Power (or heal with Soft-Boiled if needed) to build Tera Orb charge while waiting for Hydreigon to raise its shield at 85% and wipe player stats at 80% time remaining.
- Turns 4 to 9 (Stack Maximum Boosts): As soon as Hydreigon resets your stats and abilities at the 80% timer mark, use Calm Mind six times to reach +6 Special Attack and +6 Special Defense. Keep your HP comfortably above 50% with Soft-Boiled whenever needed.
- Turn 10 Onward (Tera Psychic and Nuke): With 12 total stat boosts stacked (+6 Sp. Atk and +6 Sp. Def), Stored Power reaches a massive 260 base power before Tera STAB and super-effective multipliers. Terastallize into the Psychic Tera Type and spam Stored Power to shatter the shield and finish off Hydreigon with plenty of time to spare.
Two Strong Alternatives: Contrary Malamar Skill Swap and Mew
If you want to turn Hydreigon's own script against it or team up in co-op, two alternative counters stand out:
- Contrary Malamar (Skill Swap Strategy): Bringing a Psychic Tera Malamar holding a Shell Bell with the Contrary ability lets you use Skill Swap on Turn 1. Giving Contrary to Hydreigon strips away its Levitate immunity and reverses all of its stat buffs: when Hydreigon uses Dragon Dance at 85% and two scripted Nasty Plots at 70% and 55% HP, it actually drops its own Special Attack by two stages (-2) each time! Once the 80% player stat wipe passes, Malamar can boost with Calm Mind and sweep with Stored Power or Psycho Cut.
- Psychic Tera Mew: Running a 252 HP / 252 Special Attack Modest Mew holding a Shell Bell or Covert Cloak with Amnesia, Nasty Plot, Stored Power, and Life Dew provides an easy balance of bulk and firepower while fans also keep an eye on Pokémon Japan's hidden countdown teasing a potential Ruby and Sapphire Switch reveal by November 30.
All 7-Star Mighty Hydreigon Raid Rewards and Drops
Even though you can only catch one Mighty Hydreigon per save file (and cannot catch a second one if you already caught it during its original run), you can farm the raid repeatedly through November 5 for high-value training items:
- Guaranteed First-Clear Rewards: 1 Ability Patch and 1 TM140 (Nasty Plot).
- Repeatable Farmable Drops: Large bundles of Poison Tera Shards, Exp. Candy L and XL, Calcium vitamins, Bottle Caps, Nuggets, Ability Capsules, and a chance at Herba Mystica for Shiny sandwich crafting.
Comparison of the 3 Best Counters Against 7-Star Hydreigon
| Pokémon | Tera & Held Item | Ability & Nature | Core Moveset |
|---|---|---|---|
| Blissey (#1 Solo) | Psychic / Covert Cloak | Natural Cure / Calm | Calm Mind, Stored Power, Soft-Boiled, Light Screen |
| Malamar (Anti-Buff) | Psychic / Shell Bell | Contrary / Careful | Skill Swap, Calm Mind, Stored Power, Psycho Cut |
| Mew (All-Rounder) | Psychic / Covert Cloak | Synchronize / Modest | Nasty Plot, Amnesia, Stored Power, Life Dew |
Based on the outskirts of New York City, Chaya 'Chayane' spent five years studying software engineering in Montreal before returning to her home state. A Full-Stack developer and Deep Learning AI architecture researcher, she explores neural networks and algorithmic optimization while engineering data pipelines for Retrocharting and Gamescharting alongside Grimtag. A gamer for over 20 years and an avid collector of Nintendo history and The Legend of Zelda, she explored World of Warcraft's Azeroth before bringing her deep technical background to video game analysis.
