Weather

Weather is an important aspect of dungeons and should always be taken into account as it impacts gameplay and dungeon difficulty. Ιt also affects the aesthetics of the overworld.

Weather occurs naturally in most dungeons or is triggered by enemy Pokemon's abilities. Obviously, most enemy Pokemon in a dungeon are adapted to the local weather and benefit drastically from it. For example, Pokemon with Sand Veil are usually present in Sandstorm. However, the player can break this synergy by taking advantage of the local weather or by changing the weather to his/her own advantage. In general, creating weather-based synergy within the team or party can significantly boost chances of survival in tough dungeons and reduce conflict ("weather fights"). Players can change the weather themselves through moves, abilities and weather rocks. A weather condition lasts until entering the next floor or until someone else changes the weather (e.g. a Drizzle Pokemon spawning or a Cherrim using Sunny Day). Weather moves can be used anytime, but weather abilities require the Pokemon to enter the floor to be triggered. Weather rocks are items that need to be held by a team member to give a weather condition effects to the player only, provided that the external weather is clear (except for the clear rock that overwrites other weather conditions). Weather rocks can be purchased from the Dark Market in Tanren Undercity. In PMU, weather is also crucial because it activate Gems. These are bag items that give significant buffs to your team's Pokemon of the same type, either by granting immunity to status problems or by giving Speed Boost to that type. Since PMU is a real-time (rather than turn-based) game and status problems are very common, Gems make a great deal in planning out a strategy. PMU 7 features the weather conditions encountered in PMD and the core series, as well as introduces its unique weather, Diamond Dust. There are a total of 8 different weather conditions (9 if clear weather is considered), each with different gimmicks. Most conditions buff or nerf a particular Pokemon type, but also have general effects that affect all types. In this sense, some family items activate only during particular weather conditions.

Clear
Clear weather is the standard weather and has no particular effects. It is crucial for the activation of weather rocks.
 * Cannot be triggered by moves
 * Triggered by the ability Cloud Nine (Golduck, Lickilicky and Altaria lines)
 * Triggered by the Clear Rock when held by a team member. Does not stack with other weather rocks
 * Typically used in conjunction with weather rocks
 * Activates the Fight, Sky, Guard (Bug) and Dragon Gems

Cloudy
This is considered the weather for Normal-types. It essentially nerfs all types but Normal, but its effects are not that devastating or even noticeable.
 * Cannot be triggered by moves or abilities
 * Triggered by the Cloudy Rock in clear weather
 * Reduces damage by non-Normal moves by 25%
 * Reduces HP regain by Morning Sun, Moonlight and Synthesis
 * Activates some family items for Normal-types
 * Activates the White (Normal), Poison and Thunder Gems

Rain
The weather that buffs Water and nerfs Fire.
 * Triggered by the move Rain Dance
 * Triggered by the ability Drizzle (Politoed, Pelipper, Kyogre)
 * Triggered by the Damp Rock when held by a party member in clear weather
 * Doubles damage by Water moves
 * Halves damage by Fire moves
 * Raises the accuracy of the moves Thunder and Hurricane to 100%
 * Reduces HP regain by Morning Sun, Moonlight and Synthesis
 * Longer recharge time for Solar Beam
 * Makes the floor damp (prevents explosions by items, traps, moves or abilities)
 * Activates the abilities Swift Swim, Hydration, Dry Skin, Rain Dish, Forecast
 * Activates some family items for Water-types
 * Activates the Aqua Gem

Sunny
Opposite to the Rain, this weather buffs Fire and nerfs Water. Additionally buffs Grass and Fairy-types, creating good synergy between the three types.
 * Triggered by the move Sunny Day
 * Triggered by the ability Drought (Ninetales line, Torkoal, Groudon)
 * Triggered by the Heat Rock when held by a party member in clear weather
 * Doubles damage by Fire moves
 * Halves damage by Water moves
 * Cuts the accuracy of the moves Thunder and Hurricane to 50%
 * Raises HP regain by Morning Sun, Moonlight and Synthesis
 * Shorter recharge time for the move Solar Beam
 * The move Growth raises Attack and Special Attack by two levels
 * Pokemon cannot be frozen
 * Activates the abilities Chlorophyll, Dry Skin, Flower Gift, Leaf Guard, Solar Power, Forecast, while buffing Harvest
 * Activates many family items for Fire, Grass and Fairy types
 * Activates the Fiery, Grass and Pixie Gems

Diamond Dust
PMU's unique weather, Diamond Dust is the second condition to buff Fairies.
 * Cannot be triggered by moves or abilities
 * Triggered by the Sparkle Rock in clear weather
 * Fairies get Speed Boost (max movement speed)
 * Player evasion raises by one level
 * NPC evasion drops by one level

Snow
Like Fairies, Ice-types are also favored by two weather conditions, in fact exclusively. Snow works similarly to Diamond Dust, but for Ice.
 * Cannot be triggered by moves or abilities
 * Triggered by the Snowy Rock in clear weather
 * Ice-types get Speed Boost (max movement speed)
 * Reduces HP regain by Morning Sun, Moonlight and Synthesis

Hail
Hail is the second condition that favors Ice-types, while nerfing all other types.
 * Triggered by the move Hail
 * Triggered by the ability Snow Warning (Abomasnow, Amaura and Alolan Ninetales lines, Vanilluxe)
 * Triggered by the Icy Rock when held by a party member in clear weather
 * All types but Ice cannot regain HP naturally by walking and instead lose HP. Also, Pokemon with the abilities Snow Cloak, Slush Rush, Ice Body, Overcoat, and Magic Guard are immune to this effect
 * Reduces HP regain by Morning Sun, Moonlight and Synthesis
 * Activates the abilities Snow Cloak, Slush Rush, Ice Body, Forecast
 * Activates the Icy Gem

Sandstorm
Sandstorm works similarly to Hail but for the earth types. This weather buffs Rock, Ground, Steel-types, thus creating good synergy between them, while nerfing all other types. It also harms the player's vision, as it makes it very difficult to navigate through the map without Safety Goggles.
 * Triggered by the move Sandstorm
 * Triggered by the ability Sand Stream (Hippopotas line, Tyranitar, Gigalith)
 * Triggered by the Smooth Rock when held by a party member in clear weather
 * All types but Rock, Ground and Steel cannot regain HP naturally by walking and instead lose HP. Also, Pokemon with the abilities Sand Rush, Sand Veil, Sand Force, Overcoat, and Magic Guard are immune to this effect
 * Raises the Special Defense of Rock-types by 33%
 * Reduces HP regain by Morning Sun, Moonlight and Synthesis
 * Reduces visibility without Safety Goggles
 * Activates the abilities Sand Rush, Sand Veil, Sand Force
 * Activates the Stone, Earth and Metal Gems

Fog
The fog is the weather condition that buffs the mystical types Psychic, Ghost and Dark, while nerfing Electric-types. It also harms the player's vision, as it makes it very difficult to navigate through the map without Safety Goggles.
 * Cannot be triggered by moves or abilities
 * Triggered by the Foggy Rock in clear weather
 * Halves the damage by Electric moves
 * Reduces HP regain by Morning Sun, Moonlight and Synthesis
 * Reduces visibility without Safety Goggles
 * Activates the Psyche, Shadow and Dark Gems