[Scripting Question] How do you give a route Rain, Electric Terrain, and permanent Tailwind against the player?

[SuperSpyroDragon64]

How do you give a route permanent Rain, permanent Electric Terrain, and permanent Tailwind against the player?

If the player tries anything to change the weather in this area it should fail. It's for important lore and gameplay difficulty reasons.

 

[Swdfm]

Hi @SuperSpyroDragon64
When trying to do a task like this, the trick is to think in smaller stages.

The rough steps would be as follows:
NOTE: I'm presuming that there are no changes to the overworld
0) Write a method checking to see if the player is on the map
1) Have it such that it is rain upon entry in the battle. This is made easier thanks to things like overworld weather.
2) Have it such that it is electric terrain upon entry in the battle
3) Have it such that it is an opposing Tailwind all the time. This one is more difficult
4) Have it such that rain never ends.
5) Have it such that electric terrain never ends
6) Have it such that Tailwind never ends, if it is the opponent's
7) Stop the player from changing the weather
8) Stop the player from changing the terrain
9) Stop the player from changing the tailwind
At the moment, only Defog can stop Tailwind, so let's have Defog fail on this map

This should cover Step 0)

Spoiler:

PERMA_RAIN_MAP = 69 # Call the constant what you wish, and set to the right map ID
def pbOnPermaRainMap?
  # Put any other conditions (Storyline variables or whatever here)
  return $game_map.map == PERMA_RAIN_MAP 
end

This should override any other settings in place
This covers Steps 1) and 2), and actually also covers steps 4) and 5) due to how defaultWeather already works
On Overworld_BattleStarting, before line:

    # Environment

Put:

Spoiler:

  # Change: Starts Electric Terrain and Rain if on special map
  if pbOnPermaRainMap?
    battle.defaultWeather = :Rain
    battle.defaultTerrain = :Electric
  end

This covers part of step 3)
On Battle_StartAndEnd, before line:

    # Abilities upon entering battle

Put:

  pbStartOpponentsTailwind

On the following:
- The first method covers the second half of step 3)
- The second method covers step 6)
- The third method covers the first half of step 7)
- The fourth method covers the first half of step 8)
Wherever you want, between all the Battle sections and Main, or in a plugin, put:

Spoiler:

class Battle
  # Added: Allows opponent to start a permanent Tailwind
  def pbStartOpponentsTailwind
    return unless pbOnPermaRainMap?
    sides[1].effects[PBEffects::Tailwind] = 5
    # Change this message if you wish!
    pbDisplay(_INTL("There is a Tailwind on the opposing side!"))
  end
  
  # Change made: ensures opponent's Tailwind doesn't run out
  def pbEORCountDownSideEffect(side, effect, msg)
    return if side == 1 && effect == PBEffects::Tailwind && pbOnPermaRainMap?
    return if @sides[side].effects[effect] <= 0
    @sides[side].effects[effect] -= 1
    pbDisplay(msg) if @sides[side].effects[effect] == 0
  end
  
  # This stops weather changing abilities from working:
  alias old_start_weather_ability pbStartWeatherAbility
  def pbStartWeatherAbility(*args)
    return if pbOnPermaRainMap?
    old_start_weather_ability(*args)
  end

  # Change: Stops terrain setting ability in special map
  # NOTE: This will still show the ability splash but not actually change the terrain
  alias old_start_terrain pbStartTerrain
  def pbStartTerrain(user, newTerrain, fixedDuration = true)
    if pbOnPermaRainMap? && !fixedDuration
      # Change this message to one of your choosing!
      pbDisplay(_INTL("But the terrain did not change!"))
      return
    end
    old_start_terrain
  end
end

This covers the second half of step 7)
Put this in the same place that I told you to put the previous block in:

Spoiler:

class Battle::Move::WeatherMove < Battle::Move
  # Change: Weather changing move fails if on special tainy map
  alias old_move_failed pbMoveFailed
  def pbMoveFailed?(*args)
    if pbOnPermaRainMap?
      # Change this to a message of your choosing
      @battle.pbDisplay(_INTL("The rain is just too strong!))
      return true
    end
    return old_move_failed(*args)
end

This covers the second half of step 8)
Put this in the same place that I told you to put the previous two blocks in:

Spoiler:

# Changes: Stops terrain move being used if on special map
class Battle::Move::StartElectricTerrain < Battle::Move
  def pbMoveFailed?(user, targets)
    if pbOnPermaRainMap? || @battle.field.terrain == :Electric
      @battle.pbDisplay(_INTL("But it failed!"))
      return true
    end
    return false
  end
end
class Battle::Move::StartGrassyTerrain < Battle::Move
  def pbMoveFailed?(user, targets)
    if pbOnPermaRainMap? || @battle.field.terrain == :Grassy
      @battle.pbDisplay(_INTL("But it failed!"))
      return true
    end
    return false
  end
end
class Battle::Move::StartMistyTerrain < Battle::Move
  def pbMoveFailed?(user, targets)
    if pbOnPermaRainMap? || @battle.field.terrain == :Misty
      @battle.pbDisplay(_INTL("But it failed!"))
      return true
    end
    return false
  end
end
class Battle::Move::StartPsychicTerrain < Battle::Move
  def pbMoveFailed?(user, targets)
    if pbOnPermaRainMap? || @battle.field.terrain == :Psychic
      @battle.pbDisplay(_INTL("But it failed!"))
      return true
    end
    return false
  end
end

This should cover the step 9)
As far as I know, the only way to stop a Tailwind is to use Defog, so let's have Defog fail in this situation

Spoiler:

class Battle::Move::LowerTargetEvasion1RemoveSideEffects < Battle::Move::TargetStatDownMove
  # Changes: Ensures Defog fails on special map so as not to blow away Tailwind
  alias old_fails_against_target pbFailsAgainstTarget
  def pbFailsAgainstTarget?(*args)
    return true if pbOnPermaRainMap?
    return old_fails_against_target (*args)
  end
[/code[[/spoiler]

Hope this helped! This took forever! Would appreciate a credit if used!
Swdfm