Weather Effects

Weather effects have been in the games since Gold & Silver. They all have numerous effects for multiple Pokémon, attacks and ability. There are Four kinds of true weather in the game and 2 extra ones that can also be classes as such. Some Pokémon can cause the weather with their abilities and others, with the abilities of Air Lock or Cloud Nine can have their abilities dispell the weather. In addition to this, the ability of Dust-proof will prevent the Pokémon from receiving damage from the weather such as Hail and Sandstorm. In battle in Black & Wite, you'll have the ability of seeing what the current weather is at any point during the battle

Each Weather Effect once called upon using their respective attacks lasts for 5 turns. However, these can be increased through having the user of the attack hold specific items. As of X & Y, they also prolong the weather effects from abilities. The items as such are below:

Picture Name Effect
Damp Rock Prolongs number of turns of Rain Dance
Heat Rock Prolongs number of turns of Sunny Day
Icy Rock Prolongs number of turns of Hail
Smooth Rock Prolongs number of turns of Sandstorm

The weather types and the effects are as follows:

Sunshine

Sunny Day is the more common weather effect, primarily used by Fire and/or Grass types

Activation Means:
Using Move Sunny Day, obtained through TM 11
Using a Pokémon that has the Drought Ability. Note, as of X & Y, this will only last 5 turns.
Several routes in Ruby & Emerald are afflicted with it. Routes 124 to 130 & Sootopolis City are affected after Groudon has been awakened. Routes 114, 115, 116 & 118 are affected when Terra Cave has been spotted in that location in Emerald

Sunshine
Effects:
Fire Type move's Base Power is increased by 50%
Water Type move's Base Power is decreased by 50%
Solar Beam does not require charging
Thunder's accuracy is reduced to 50%
Hurricane's accuracy is reduced to 50%
Synthesis. Morning Sun & Moonlight recover 66% of user's HP
Pokémon with the Chlorophyll Ability have their Speed raised
Pokémon with the Dry Skin Ability received double damage from Fire attacks and loses HP each turn
Cherrim's Flower Gift Ability increases it's Attack & Special Attack and changes it's form
Pokémon with the Leaf Guard Ability are protected from status afflictions
Pokémon with the Solar Power Ability have their Special Attack raised but HP lowered
Castform transforms into a Fire type Pokémon
The attack Weather Ball's Power doubles and becomes Fire Type
Weather Ball


Rain

Rain Dance is the other more common weather effect, primarily used by Water and/or Electric types

Activation Means:
Using Move Rain Dance, obtained through TM 14
Using a Pokémon that has the Drizzle Ability. Note, as of X & Y, this will only last 5 turns.
Several routes in Sapphire & Emerald are afflicted with it. Routes 124 to 130 & Sootopolis City are affected after Kyogre has been awakened. Routes 105, 125, 127 & 129 are affected when Marine Cave has been spotted in that location in Emerald
In RSE, Routes 119, 120 & 123 are afflicted by rain.
In DP, Routes 213, 214 & 215 are afflicted by rain
In BW, the Routes with Tornadus & Thundurus in will be rainy. Random routes will also have rain at varying times

Rain Dance
Effects:
Water Type move's Base Power is increased by 50%
Fire Type move's Base Power is decreased by 50%
Solar Beam requires two turns of charge
Thunder's accuracy is increased to 100%, being able to break through Protect & Detect 25% of the time
Hurricane's accuracy is increased to 100%, being able to break through Protect & Detect 25% of the time
Synthesis. Morning Sun & Moonlight recover 25% of user's HP
Pokémon with the Dry Skin Ability recovers HP every turn and 1/4 its HP when hit by a Water Attack
Pokémon with the Hydration Ability are cured from status afflictions whenever it rains
Pokémon with the Rain Dish Ability have 1/16th of their max HP recovered each turn
Pokémon with the Swift Swim Ability have their Speed raised
Castform transforms into a Water type Pokémon
The attack Weather Ball's Power doubles and becomes Water Type
Weather Ball


Hail

Hail is one of the seldom seen weather effects

Activation Means:
Using Move Hail, obtained through TM 07
Using a Pokémon that has the Snow Warning. Note, as of X & Y, this will only last 5 turns.
In DP, Routes 216, 217 are constantly afflicted by hail
In BW, Routes 6, 7, 8, Moor of Icirrus, Icirrus City & Twist Mountain are afflicted by hail during Winter

Hail
Effects:
All non-Ice type Pokémon are damaged each turn
Bizzard's accuracy is increased to 100%, being able to break through Protect & Detect 25% of the time
Synthesis. Morning Sun & Moonlight recover 25% of user's HP
Pokémon with the Ice Body Ability have 1/16th of their max HP recovered each turn
Pokémon with the Snow Cloak Ability have their evasion boosted by 20%. Outside battle in 216 & 217, if head of the party, the wild encounter rate is decreased by 50%
Castform transforms into a Ice type Pokémon
The attack Weather Ball's Power doubles and becomes Ice Type
Weather Ball


Sandstorm

Sandstorm is a relatively common weather effect

Activation Means:
Using Move Sandstorm, obtained through TM 37
Using a Pokémon that has the Sandstream. Note, as of X & Y, this will only last 5 turns.
In RSE, Route 111's Desert is constantly afflicted by sandstorms
In DP, Route 228 is constantly afflicted by sandstorms
In BW, Route 4 and the Resort Desert are constantly afflicted by Sandstorms
Sandstorm
Effects:
All non-Rock, Ground or Steel type Pokémon are damaged each turn
Rock type Pokémon's Special Defense is increased by 50%
Solar Beam power is reduced
Synthesis. Morning Sun & Moonlight recover 25% of user's HP
Pokémon with the Sand Veil Ability have their evasion boosted by 20%. Outside battle in 111 & 228, if head of the party, the wild encounter rate is decreased by 50%
Pokémon with the Sand Rush Ability have their Speed doubled
Pokémon with the Sand Force Ability have their Ground, Steel & Rock move strength increased by one stage
The Weather Ball attack's Power doubles and becomes Rock Type
Weather Ball


Fog

Fog is a relatively unknown Weather Effect

Activation Means:
There is no way to activate it as of yet
In DP, Route 210, Victory Road & Turnback Cave are afflicted with fog
It can be cleared using the move Defog, obtained through HM 05


Effects:
All Pokémon's Accuracy is reduced
Fog


Shadow Sky

Shadow Sky is a weather effect exclusive to Pokémon XD

Activation Means:
Using Move Shadow Sky, known by several Shadow Pokémon

Effects:
All non-Shadow Pokémon are damaged each turn
The Weather Ball attack 's Power doubles and becomes ??? Type, having no Weaknesses or Resistances
Shadow Sky
 
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