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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 Pokemon 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 Pokemon 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 (evolves via using Dragon's 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
Along with new forms, various new methods to change specific Pokemon forms have also been implemented. These are discussed below.
Every mega evolution is actually just a form of the base Pokemon. When holding the specific mega stone for the species, the Pokemon will mega evolve.
Darmanitan with their Hidden Ability bit set get the ability Zen Mode. This allows for Darmanitan to swap between Zen Mode and Normal Mode as it pleases. Galarian Darmanitan will become Galarian Zen Mode Darmanitan as well.
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.
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.
Deerling and Sawsbuck in the PC do not change form. They only change form in the party. They change form if the code ever accesses the player's party directly from the save (which it will basically instantly).
Each season lasts a month. Spring is in January, May, and September. Summer is in February, June, and October. Autumn is in March, July, and November. Winter is then in April, August, and December. This mimics the Gen 5 season system.
While there is currently no way to transform Keldeo Ordinary to Resolute, Keldeo Resolute, upon forgetting Sacred Sword, will transform back into Keldeo Ordinary.