Acid rain is a glitch in Pokémon Platinum, HeartGold and SoulSilver that results in the simultaneous occurrence of multiple types of weather at once, thus damaging all Pokémon on the field. Even though it was discovered before the English release of Platinum, it is present in all versions of the mentioned games.
If any weather effect (including Trick Room, Gravity, and Uproar, but excluding rain) is in effect, and a player of Platinum, HeartGold, or SoulSilver uses Pursuit on a Pokémon that is switching out on that turn and causes it to faint, this glitch will activate. Upon sending out the next Pokémon, the weather will have changed, and all four types of weather will be occurring at once until the end of the battle.
- Trick Room
- Fog (hurts after animation)
- Hail (hurts after animation)
- Sunshine (hurts after animation)
- Sandstorm (hurts after animation)
- Rain (hurts after animation; glitch cannot be activated using this weather)
Even if the Pokémon is normally immune to a type of weather due to its type (Ice-type Pokémon with hail, and Rock-, Ground-, and Steel-type Pokémon with a sandstorm), they will accumulate damage four times each turn, with the cause of the damage identified as their Ability, rather than the weather. In this way, a Pikachu in battle can be hurt by its Static, a Weezing by its Levitate, or an Empoleon by its Torrent.
Conversely, a Pokémon with an Ability that heals it in certain types of weather, such as Ice Body or Rain Dish, will not take damage, but instead be healed four times every turn until they are fully healed, and then, the weather will hurt it. Dry Skin, which heals in some weather and hurts in other weather, will work as it normally does, healing with one condition and hurting with the other.
Both Thunder and Blizzard will ignore accuracy and evasion checks, due to simultaneous rain and hail. SolarBeam will require no charging due to the sun, but its damage will also become decreased by 50% due to the other three types of weather.
If a Castform or Cherrim is brought into battle, their Abilities will cause them to constantly transform, thus locking up the battle until the game is turned off. Castform will only transform between its Sun and Rain forms due to those particular types of weather being the first two to occur (and thus, Castform recognizes these as being the only two types of weather on the field).
Weather Ball's type is the type of the highest priority weather that can change Weather Ball's type. For example, if the glitch was performed using Harsh sunlight, Weather Ball would be Fire type. If it was performed using Gravity, it would be Ice type because hail has the highest priority of the four present weather conditions.
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