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Form System Documentation
This page serves to document the additional forme changes and to document how the form system works.
Firstly, the form system in HGSS is very all over the place. Each individual system (icons, learnsets, personal data, etc.) has some sort of appending to the original narc that occurs that contains the form data. Most functions then have a massive if statement table to determine what the actual index is. Icons specifically have 50 extra slots after the original 493.
As a result of this, expanding this system starts at 544. Expanded Pokémon indices go from 544 (Victini) to 955 (Enamorus). New form data, in all narc files, then resumes at 956. Forms for Gens 3 and 4 still use their sprite and icon data from the vanilla game for the most part (as that is still handled by the if statements), but new forms are handled by the table PokeFormDataTbl in src/pokemon.c. This is an array of FormData structures and specifies the base species, the form number, whether or not the form should be reverted after battle, and the new species that the form data will come from.
The FormData structure:
struct FormData
{
u16 species;
u16 form_no:15;
u16 need_rev:1;
u16 file;
};This structure is then iterated through to find which file to read from for Pokémon with forms.
Adding new forms is then exactly just like adding new species, just adding the new data to all the folders necessary. We use SPECIES_* constants just about everywhere we can--the new form data is no exception, with each form data getting a constant, i.e. SPECIES_MELOETTA_PIROUETTE or SPECIES_KYUREM_BLACK.
- Mega Evolutions
Venusaur
Charizard X
Charizard Y
Blastoise
Beedrill
Pidgeot
Alakazam
Slowbro
Gengar
Kangaskhan
Pinsir
Gyarados
Aerodactyl
Mewtwo X
Mewtwo Y
Ampharos
Steelix
Scizor
Heracross
Houndoom
Tyranitar
Sceptile
Blaziken
Swampert
Gardevoir
Sableye
Mawile
Aggron
Medicham
Manectric
Sharpedo
Camerupt
Altaria
Banette
Absol
Glalie
Salamence
Metagross
Latias
Latios
Rayquaza (can mega evolve when it knows Dragon Ascent)
Lopunny
Garchomp
Lucario
Abomasnow
Gallade
Audino
Diancie
- Primal Reversions
Kyogre
Groudon
- Alolan Forms
Rattata
Raticate
Raichu
Sandshrew
Sandslash
Vulpix
Ninetales
Diglett
Dugtrio
Meowth
Persian
Geodude
Graveler
Golem
Grimer
Muk
Exeggutor
Marowak
- Galarian Forms
Meowth
Ponyta
Rapidash
Slowpoke
Slowbro
Farfetch'd
Weezing
Mr. Mime
Articuno
Zapdos
Moltres
Slowking
Corsola
Zigzagoon
Linoone
Darumaka
Darmanitan (both Zen Modes included)
Yamask
Stunfisk
- Cosmetic Forms
Pikachu
Cosplay
Rock Star
Belle
Pop Star
Ph.D
Libre
Original Cap
Hoenn Cap
Sinnoh Cap
Unova Cap
Kalos Cap
Alola Cap
Partner Cap
World Cap
Basculin
Red Stripe is form 0
Blue Stripe
White Stripe
Deerling
Spring is form 0
Summer
Autumn
Winter
Sawsbuck
Spring is form 0
Summer
Autumn
Winter
Thundurus Therian
Landorus Therian
Kyurem
White
Black
Genesect
Douse
Shock
Burn
Chill
Vivillon
Meadow is form 0
Polar
Tundra
Continental
Garden
Elegant
Meadow
Modern
Marine
Archipelago
High Plains
Sandstorm
River
Monsoon
Savanna
Sun
Ocean
Jungle
Fancy
Poké Ball
Flabébé
Red Flower is form 0
Yellow Flower
Orange Flower
Blue Flower
White Flower
Floette
Red Flower is form 0
Yellow Flower
Orange Flower
Blue Flower
White Flower
Eternal Flower
Florges
Red Flower is form 0
Yellow Flower
Orange Flower
Blue Flower
White Flower
Furfrou
Natural is form 0
Heart
Star
Diamond
Debutante
Matron
Dandy
La Reine
Kabuki
Pharaoh
Pumpkaboo
Medium is form 0
Small
Large
Super
Gourgeist
Medium is form 0
Small
Large
Super
Oricorio
Baile is form 0
Pom Pom
Pa'u
Sensu
Lycanroc
Day is form 0
Midnight
Dusk
Toxtricity Low Key
Sinistea Antique
Polteageist Antique
Alcremie
Strawberry Sweet is form 0
Berry Sweet
Love Sweet
Star Sweet
Clover Sweet
Flower Sweet
Ribbon Sweet
Calyrex
Ice Rider
Shadow Rider
- Battle Forms
Castform
Normal is form 0
Sunny
Rainy
Snowy
Shellos East Sea
Gastrodon East Sea
Dialga Origin
Palkia Origin
Meloetta Pirouette
Greninja Ash
Aegislash Blade
Xerneas Active
Zygarde
50% is form 0
10%
10% Power Construct
50% Power Construct
10% Complete
50% Complete
Minior
Red is form 0
Orange
Yellow
Green
Blue
Indigo
Violet
Core Red
Core Orange
Core Yellow
Core Green
Core Blue
Core Indigo
Core Violet
Necrozma
Base is form 0
Dusk Mane
Dawn Wings
Ultra Dusk Mane
Ultra Dawn Wings
Cramorant
Base is form 0
Gulping
Gorging
Morpeko Hangry
Zacian Crowned
Zamazenta Crowned
Eternatus Eternamax
Enamorus Therian
- Hisuian Forms
Growlithe
Arcanine
Voltorb
Electrode
Typhlosion
Qwilfish
Sneasel
Samurott
Lilligant
Zorua
Zoroark
Braviary
Sliggoo
Goodra
Avalugg
Decidueye
- Significant Gender Differences
Unfezant
Frillish
Jellicent
Pyroar
Meowstic
Indeedee
Basculegion
Oinkologne
- Paldean Forms
Maushold
Base is Family of 4
Family of 3
Squawkabilly
Green is form 0
Blue
Yellow
White
Palafin
Zero is form 0
Hero
Tatsugiri
Curly is form 0
Droopy
Stretchy
Dudunsparce
Four Segment is form 0
Three Segment
Gimmighoul
Base is form 0
Roaming
Wooper
Base is form 0
Paldean
Tauros
Base is form 0
Combat
Blaze
Aqua
Revavroom
Base is form 0
Segin
Schedar
Navi
Ruchbah
Caph
Poltchageist/Sinistcha
Base is form 0
Antique
Ogerpon
Base is form 0
Wellspring Mask
Hearthflame Mask
Cornerstone Mask
Terapagos
Base is form 0
Terastal
Stellar
Ursaluna
Base is form 0
Bloodmoon
Along with new forms, various new methods to change specific Pokémon forms have also been implemented. These are discussed below.
While Gen 4 was the generation that introduced gender differences, the things that could differ between genders was very limited. As a result, significant gender differences (that at least change icons between genders) require separate forms.
Unfezant, Frillish, Jellicent, Pyroar, Meowstic, Indeedee, and Basculegion are currently the only ones this applies to. These wild Pokémon--when generated--will swap between the forms at a 50/50 rate except for Pyroar, which is female 7/8 of the time in accordance with the gender split of future generations. This is governed in src/pokemon.c in UpdatePassiveForms.
Tranquill, Litleo, Espurr, and White Stripe Basculin all have their evolutions tweaked to force females to evolve into the female form. Specifically, when a female evolves, it will set its form to the female form. This is done by an evolution table overhaul that allows us to specify forms as such:
evodata SPECIES_LITLEO
evolutionwithform EVO_LEVEL_MALE, 35, SPECIES_PYROAR, 0
evolutionwithform EVO_LEVEL_FEMALE, 35, SPECIES_PYROAR, 1
evolution EVO_NONE, 0, SPECIES_NONE
evolution EVO_NONE, 0, SPECIES_NONE
evolution EVO_NONE, 0, SPECIES_NONE
evolution EVO_NONE, 0, SPECIES_NONE
evolution EVO_NONE, 0, SPECIES_NONE
evolution EVO_NONE, 0, SPECIES_NONE
evolution EVO_NONE, 0, SPECIES_NONE
terminateevodata
Specifying a form of 0 in the evolution doesn't actually change forms upon evolution. This can be solved by specifying an invalid form for the Pokémon in the form field, such as is done for White-Stripe Basculin, with form 0, to evolve into Basculegion:
// evolution methods/parameters are placeholder until those have been implemented
evodata SPECIES_BASCULIN_WHITE_STRIPED
evolutionwithform EVO_LEVEL_MALE, 0, SPECIES_BASCULEGION, 2 // set to invalid form to force loading male form assets
evolutionwithform EVO_LEVEL_FEMALE, 0, SPECIES_BASCULEGION, 1
evolution EVO_NONE, 0, SPECIES_NONE
evolution EVO_NONE, 0, SPECIES_NONE
evolution EVO_NONE, 0, SPECIES_NONE
evolution EVO_NONE, 0, SPECIES_NONE
evolution EVO_NONE, 0, SPECIES_NONE
evolution EVO_NONE, 0, SPECIES_NONE
evolution EVO_NONE, 0, SPECIES_NONE
terminateevodata
Every mega evolution is actually just a form of the base Pokémon. When holding the specific mega stone for the species, the Pokémon will mega evolve.
Deerling and Sawsbuck in the PC do not change form. They only change form in the party.
They update at the same time as the checks for Shaymin that would revert to Land forme would update--time needs to move forward for it to actually change, moving backwards will not properly update the party.
Wild Deerling and Sawsbuck are generated according to the current season, which is just Spring - Summer - Fall - Winter, in that order, starting from January:
| Season | Months |
|---|---|
| Spring | January, May, September |
| Summer | February, June, October |
| Autumn | March, July, November |
| Winter | April, August, December |
Darmanitan with their Hidden Ability bit set get the ability Zen Mode. This allows for Darmanitan to swap between Zen Mode and Normal Mode. Zen Mode activates in-battle when Darmanitan's HP falls below half, turning it to Zen Mode Darmanitan. Galarian Darmanitan will become Galarian Zen Mode Darmanitan as well.
Kyurem that have the DNA Splicers used on them set a chain of events off:
- First, it checks for the forme of the Kyurem.
- If the forme is 0, then it looks for a Reshiram or a Zekrom in the party starting from the front going to the back.
- If it finds one, then it stores the Reshiram or Zekrom in the save as it is. A flag (separate from the scripting flags) also in the save is set that tells us that a Reshiram/Zekrom is stored.
- The Reshiram or the Zekrom is deleted from the party.
- The Kyurem then transforms into the respective forme (White or Black depending on if Reshiram or Zekrom was chosen).
- Finally, Scary Face and Glaciate are replaced with Fusion Flare/Bolt and Ice Burn/Freeze Shock, respectively (if they are present).
- If the forme is not 0 and a Reshiram/Zekrom is stored in the save properly, then it looks for a free party spot starting from the front going to the back.
- If there is a free spot, then the Reshiram or Zekrom is added to the first available free spot.
- The Reshiram or the Zekrom is deleted from the save and the flag is cleared.
- The Kyurem then reverts to forme 0.
- Fusion Flare/Bolt is replaced with Scary Face, and Ice Burn/Freeze Shock is replaced with Glaciate.
While there is currently no way to transform Keldeo Ordinary to Resolute, Keldeo Resolute, upon forgetting Sacred Sword, will transform back into Keldeo Ordinary.
A Meloetta using Relic Song changes into its Pirouette Forme. When switching out or fainting, the Meloetta changes back to its normal forme.
A Genesect given any one of its Drive items will have that drive inserted on its head.
Tornadus, Thundurus, Landorus, and Enamorus--when a Reveal Mirror is used on them--will transform to and from their Therian formes and their Incarnate formes.
A Greninja with form id 1 will have the Battle Bond ability. In battle, said Greninja will transform into Ash Greninja when a move it uses directly causes another Pokémon to faint. This reverts upon fainting or the battle's ending. However, a Greninja that has transformed can still retransform upon revival in battles.
Wild Vivillon will default to Meadow form until the player sets their location in the GTS. Upon doing this, the Vivillon form will change to emulate how it is described in Bulbapedia. The full list of countries that give a specific form are:
Vivillon Forms per Location
| Location | Vivillon Form |
|---|---|
| Country | Meadow |
Aegislash with Stance Change will transform into Blade Form when attacking in battle, and Shield Form when using King's Shield in battle. It also reverts when switching and on battle end.
Pumpkaboo and Gourgeist automatically randomly choose between their forms in wild battles.
In battle, Xerneas turns into Active Forme. It reverts at the end of the battle.
A Rockruff that evolves at Night will evolve into Lycanroc's Midnight form. When evolving during the day, the Daytime form will be the target.
A Rockruff with form 1 is an Own Tempo Rockruff. This can only evolve into Lycanroc's Dusk Form when it levels up during Dusk, which is the hour of 5PM.
A Toxel with any of the Low Key natures will evolve into a Low Key Toxtricity. The other natures will evolve into an Amped Toxtricity.
The Low Key natures are as follows: Adamant, Brave, Docile, Hardy, Hasty, Impish, Jolly, Lax, Naive, Naughty, Quirky, Rash, and Sassy.
Sinistea, Polteageist, Poltchageist, and Sinistcha all have a 5% chance of generating as their authentic form. There is no visible difference.
When damaged in battle by a physical move, the Ice Face ability activates and the Eiscue is transformed into its Noice Face form. This prevents the damage from being applied.
If Hail then starts after the Ice Face has been broken through, the Ice Face will regenerate.
A wild Dunsparce or Dudunsparce has a 1% chance of being a three-segment form Dudunsparce instead of the normal four-segment.
A wild Tandemaus or Maushold has a 1% chance of being a family of three Maushold instead of the normal family of four.
A wild Tatsugiri will randomly be any of its Curly, Droopy, or Stretchy forms.