Gale Winds:
New weather.
Conditions:
Flying types that use flying moves get a +2 priority, and a 1.33x STAB (This is less than normal...). However, at the gain of speed, their Defense and SDef stat is cut to -2.
Grass does 50% damage in this weather.
Hazards are removed and cannot be set in it.
Whirlwind is at -2 priority, so +0 when flying types use it.
All other types lose 1/16 max health.
Hurricane gets 100% accuracy but has 25% damage dealt as recoil.
Soundproof clears the weather.
Ability: Gale Winds
Summons Gale Winds.
This is a hidden ability for Staraptor, Skarmory, and Pidgeot.
Move: Windstorm
Summons Gale Winds. Learned through all flying types.
Ability: Winds of Tranquility
Prevents the Pokemon from losing stats in Gale Winds.
Sigilyph and Xatu.
Item: Wind in a Jar
Extends duration of Gale Winds.
Thin Air
Also a new weather.
Conditions:
Flying types are grounded.
All moves but normal are weakened 50%
Fighting types have a reduced speed -2.
Non normal / Steel types take damage at the end of every turn. Exactly like toxic.
Accuracy is -1.
Any Pokemon with a Weather ability such as Swift Swim or Dry Skin is slowed -1.
Ability: Elevation Change:
Summons Thin Air. Metagross and Skarmory. HA. (Subject to change. This is hard.)
Move: Oxygen Erode
Summons Thin Air.
Ability: Air Resistant
Immune to Thin Air. Snorlax.
Dollhouse Dream
New weather.
Conditions:
Fairy types get a +1 stat boost in both defenses.
Fairy types are immune to status.
Fairy types heal 1/16 per turn.
Hypnosis has 90% accuracy.
Dream Eater does 1.33x damage.
Ghosts and Darks have 50% attacking moves
Fairy type moves have 100% accuracy.
Ability: Wonderland
Summons Dollhouse Dream. Clefable, Gardevoir, and Wigglytuff.
Move: Sweet Dreams
Summons Dollhouse Dream.
Ability: Bittersweet
In Dollhouse Dream, Pokemon with Bittersweet are affected double with Non attacking moves. Sylveon, Slurpuff, and Aromatisse have it.
Item: Fairy Glitter
Extends the duration of Dollhouse Dream.
Dark Night
Weather.
Conditions:
Dark / Ghost types get +1 in both defenses
Fairy and Psychics have weakened moves 50%
Sleep inducing moves get 100% accuracy.
Dream Eater and Nightmare do 1.5x more damage.
Non Ghost and Dark types have all moves lose 5% accuracy and take 1/16 damage each turn.
Moonblast has 100% accuracy, and Moonlight 100% healing.
Ability: Dark Nightmare
Summons Dark Night. Zoroark, and Dusclops get as HAs.
Move: Dark Haze
Summons Dark Night, given to most Ghosts and Darks.
Ability: Fear Manifest
Gives +1 speed in Dark Night. Mismagius, Froslass, Sableye, Cacturne, and Crawdaunt get it as HAs.
Edit to Ability: Bad Dreams
Chandy, Trevenant, and Umbreon get it as HAs.
Item: Corrupted Lost Pendant
Weather of Dark Night is extended to 8.
Fighting Spirit Aura
This is the fighting weather. The idea is Aura is basically extruding into physical form, boosting Fighting types.
Conditions:
Fighting types gain 50% in Attack and Special attack.
Psychic, Normal, and Dark Pokemon have 50% attacking power.
Fighting types are immune to flinch and lowering of Speed.
Status does 50% less damage.
Pokemon with Reckless, Rivalry, Technician, or Sheer Force take 1/16 damage every turn, no unsportsmanlike conduct.
Ability: Fighting Spirit
Summons Battle Spirit Aura. HA for Lucario and the 4 Horses. (Keldeo, Terrakion, Virizion, and Cobalion)
Move: Adrenaline Spirit
Summons BSA. Used by Normal and Fighting.
Ability: Reckless Rush
Under BSA, this Pokemon gains 75% attacking power but takes 75% of damage dealt as recoil. Primape, Poliwrath, Breloom, Toxicroak and Medicham get this as a HA.
Mythic Distortion
Dragon weather.
Conditions:
Dragon types gain 50% Defense and Special Defense.
Rock types do 50% less attacking damage.
Ice types do 50% more damage to dragons.
All types do 50% less damage, excluding Dragon and Ice.
All Pokemon other than Dragons take 1/16 damage a turn.
Fairy types gain 50% speed, however they are no longer SA against Dragons or immune.
Ability: Dragon's Den
Summons Mythic Distortion. HA for Lati@s, Noivern, and Salamence. All the Ubers get it except Reshi, Zekrom, and their Kyurem fusions.
Move: Mythic Calling
Summons Mythic Distortion. All Dragons get it.
Ability: Dragon Rush
If facing another Dragon type in battle during MD, this Pokemon gets +1 priority on their Dragon moves. Kingdra, Ampharos, Flygon, and Altaria.
Spring Breeze
Grass weather.
Grass types have 50% increased Defense and Special Defense.
Powder moves have 100% accuracy.
Effect Spore is 100% chance.
Leech Seed stays in even after switching, but only saps 8% health.
Leaf Guard has effect.
Sap Sipper has 50% more effectiveness and heals 25% HP when hit by a grass move.
Flying types do 50% less attacking damage.
Thunder and other weather moves have 50% accuracy.
Status does double damage.
Cherrim gets his Sunny form.
Berries are refreshed every turn, like Harvest.
Grass are healed 1/16 a turn.
Ice types do 50% damage, STAB 75% more damage.
Ability: Season Change
Summons Spring Breeze. HA of Vileplume, Meganium, Tropius, Lilligant, and Jumpluff.
Move: Spring Gust
Summons Spring Breeze.
Ability: New Bloom
Prevents status if any stats are -1 or lower. Victreebel, Shiftry, Cacturne, Sceptile, and Torterra have it as HA.
More to come.
Types done:
Bug (Fondant's suggestion)
Poison (fondant's suggestion)
Water (Rain)
Sun (Fire)
Sand
Rock, Ground, Steel (Sand)
Ice (Hail)
Flying (Gale Winds)
Normal (Thin Air)
Fairy (Dollhouse Dream)
Dark / Ghost (Dark Night)
Fighting (Battle Spirit Aura)
Dragon (Mythic Distortion)
Grass (Spring Breeze)
Types to do:
Electric
Psychic
Steel
I could probably do this part myself. I think it would be cool to have weathers for all types, we could call it DB Weathers.
Feel free to add suggestions.