Acid Rain glitch

Miscellaneous glitches of Pokémon Diamond and Pearl, Pokémon Platinum, and Pokémon HeartGold and SoulSilver

Exclusive to Diamond and Pearl:
Battle Barry every day | Broken escalator glitch (Japanese only) | Choice Banded Pursuit glitch (Japanese only) | Choice Banded U-Turn glitch (Japanese only) | Dress up Hiker glitch | Egg determination glitch | Fake Tower Tycoon glitch | Honey/Sweet Scent shop glitch | Mute Route 214 glitch | Mute Sendoff Spring glitch | Protect oversight

Exclusive to Platinum:
Ace Trainer battle loop (Japanese only) | Giratina Origin Forme glitch | Trapping Ability flee glitch

Exclusive to HeartGold and SoulSilver:
Boulder push glitch | Water stream glitch | Floating walking Pokémon glitch (poison variation, menu variation) | Sequence breaking

In various or all entries:
Acid Rain glitch (Platinum/HeartGold/SoulSilver) | Grass glitch (Diamond/Pearl/Platinum) | Global Trade System glitches | Incorrect sprite for the Defog HM (Diamond/Pearl/Platinum) | Pal Park daily limit oversight | Pal Park nickname glitch | Route 224 tile oversight (Diamond/Pearl/Platinum) | VS Recorder audio glitch

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The "Simultaneous Weather Glitch" or often the "Acid Rain Glitch" refers to a glitch in Pokémon Diamond, Pearl and Pokémon Platinum which involves the initialization of multiple Weather Effects on the same turn, or arguably an undefined glitch Weather Effect.

When the Simultaneous Weather Glitch is activated the game will cause all of the Weather Effects below the current Weather Effect's priority to happen all at once in the same turn, this includes Trick Room, Gravity and Uproar which are technically considered by the game to be 'top priority Weather Effects' in their respective order.

An unusual fact about this glitch is that as long as the Pokémon does not have a 'Weather Side-Effect ignoring ability' such as Air Lock or Sand Veil all of the normal Weather Effects will deal damage to the player's Pokémon, this even includes ones which normally do not harm any Pokémon such as Rain.

In-game effects which can be used for performing this glitch

1. Trick Room - Trick Room is a first priority in-game effect, so the game should display dialogue for all of the in-game effects before it in priority; those are Gravity, Uproar, Fog, Hail, Sunshine, Sandstorm and Rain.
2. Gravity - Gravity is a second priority in-game effect, hence the game should display dialogue for the following; Uproar, Fog, Hail, Sunshine, Sandstorm and Rain.
3. Uproar - Uproar is a third priority in-game effect, hence the game should display dialogue for the following: Fog, Hail, Sunshine. Sandstorm and Rain.
4. Fog - Fog is a fourth priority in-game effect, hence the game should display dialogue for the following: Hail, Sunshine, Sandstorm and Rain.
5. Hail - Hail is a fifth priority in-game effect, hence the game should display dialogue for the following: Sunshine, Sandstorm and Rain.
6. Sunshine - Sunshine is a sixth priority in-game effect, hence the game should only display dialogue for Sandstorm, and Rain.
7. Sandstorm - Sandstorm is a seventh priority in-game effect, hence the game should only diplay dialogue for Rain.

Rain cannot be used to activate the Simultaneous Weather Glitch because it is an eighth priority in-game effect; this is the last valid Weather Effect, therefore the game will set the Weather to normal.

Castform, Cherrim and the Simultaneous Weather Glitch

Presuming that the player activated the glitch with a Weather Effect's priority that is below that of Sunshine such as Trick Room, or Hail the weather effects will alternate between Sunshine and Rain since Castform and Cherrim transform into their Sunlight Forme and Positive Forme when the Sun is in effect.Castform or Cherrim would then transform into either their Rain Forme and Negative Forme respectively for when the Rain is in effect, this would mean that Castform and Cherrim would continously switch between both of these formes in an endless loop. As a result of the endless loop the player is forced to switch off his or her game.

Requirements

1. A Pokémon with any in-game Weather Effect altering Ability or move which is not Drizzle or Rain Dance because Rain is the lowest priority Weather Effect. The player can also use moves such as Trick Room, Gravity and Uproar as the effects of these moves are technically considered as Weather effects.
2. A Pokémon with the move Pursuit.
3. The opponent Pokémon must either be on a small amount of HP or have relatively low defenses as the player has to try and defeat an opponent Pokémon with one hit by using Pursuit.

Method

1. Enter a link battle with any opponent.
2. On the first turn, set up any Weather Effect except Rain, Abomasnow, Groudon and Hippowdon are ideal because their abilities can set up either Hail, Sunlight or a Sandstorm.
3. Switch to a Pokémon with Pursuit, preferablly now the opponent should also switch to a Pokémon with relatively low HP or defenses so that the player's Pokémon can defeat the opponent's Pokémon in one hit by using Pursuit.
4. The opponent should attempt to switch their Pokémon but the player should use Pursuit and defeat it in one hit.
5. When the opponent sends out his or her next Pokémon the Simultaneous Weather Glitch should activate and Weather Effects for all the ones below the priority of the initial Weather should happen in the same turn.

See Also

1. Moves Glitch
2. Evolve Trade Evolution Pokémon Without Trading

External Links

1. [1] - A Youtube video of a player performing the Simulataneous Weather Glitch with an Hippowdon's Sand Stream ability.