Primordial Sea (Ability ID: 189)

In-Game Description

"Heavy Rain until switched out. Fire-type moves are unusable."

Extended In-Game Description (280-300 chars)

Creates Heavy Rain that lasts until user switches out. Completely nullifies all damaging Fire-type moves. Water moves gain 50% boost. Cannot be overridden by regular weather. Only other primal weather can replace it. Thunder always hits. Rain abilities activate.

Character count: 286

Detailed Mechanical Explanation

Primordial Sea creates a special primal weather condition called "Heavy Rain" that provides extreme weather control and Fire-type immunity.

Trigger Conditions

• Activates immediately when the Pokémon enters battle
• Uses onEntry hook to set ENUM_WEATHER_RAIN_PRIMAL (weather ID 6)
• Always succeeds unless another primal weather is active

Weather Properties

1. Primal Weather Classification:

   • Part of WEATHER_PRIMAL_ANY group
   • Cannot be overridden by regular weather moves/abilities
   • Only replaceable by Desolate Land or Delta Stream
   • Regular weather changes show "The weather remained unchanged!"

2. Duration:

   • Permanent while the user remains in battle
   • Ends immediately when user switches out or faints
   • No turn counter like regular weather
   • Not affected by weather-extending items

Primary Effects

1. Fire-type Move Nullification:

   • ALL damaging Fire-type moves automatically fail
   • Displays: "The Fire-type attack fizzled out in the heavy rain!"
   • Move accuracy is checked first, PP is consumed, then move fails
   • Status Fire moves (power = 0) are not affected
   • Multi-turn Fire moves are cancelled

2. Standard Rain Effects:

   • Water-type moves: 1.5x damage (50% boost)
   • Thunder and Hurricane: 100% accuracy
   • Weather Ball: Becomes Water-type, doubles in power
   • Solar Beam/Solar Blade: Power reduced to 50%
   • Moonlight/Morning Sun/Synthesis: Restore 1/4 HP

3. Ability Interactions:

   • Swift Swim: Doubles Speed
   • Rain Dish: Restores 1/16 HP per turn
   • Dry Skin: Restores 1/8 HP per turn
   • Hydration: Cures status conditions
   • Forecast: Castform becomes Water-type

Special Mechanics

• Priority System: Primal weather has absolute priority over regular weather
• Multiple Primal Users: Last one to enter overwrites (Speed determines order)
• Air Lock/Cloud Nine: Cannot suppress primal weather effects
• Weather Rocks: Have no effect on duration

Implementation Details

• Simple struct with onEntry hook in src/abilities.cc
• Triggers BattleScript_PrimordialSeaActivates
• Fire nullification handled in damage calculation with move type check
• Part of WEATHER_RAIN_ANY for general rain checks