veekun_pokedex/pokedex/data/csv/pokemon_form_groups.csv

1	pokemon_id	description
2	201	Forms only affect appearance. A form is selected at random before a wild encounter and cannot be changed.
3	351	Form changes to match the current weather.
4	386	Forms have different stats and movepools. Form changes depending on the game: normal form in Ruby/Sapphire, Attack form in Fire Red, Defense form in Leaf Green, and Speed form in Emerald. Every form exists in Diamond/Pearl/Platinum, and form is preserved when transferring from an older game. Meteorites in the south end of Veilstone City can be used to switch between forms.
5	412	Cloaks only affect appearance, although they become permanent upon evolution. Cloak changes to match the current terrain after a battle (or when an egg hatches), if possible: Plant Cloak for grassy areas, Sandy Cloak for beaches and caves, or Trash Cloak for buildings.
6	413	Forms have different stats and movepools. During evolution, the current cloak becomes the new form, and can no longer be changed.
7	421	Sunshine form is active only during Sunny Day, due to Flower Gift.
8	422	Forms only affect appearance. A form is selected before a wild encounter based on whether the battle is in Western or Eastern Sinnoh and cannot be changed.
9	423	Forms only affect appearance. A form is selected before a wild encounter based on whether the battle is in Western or Eastern Sinnoh and cannot be changed.
10	479	Forms have different signature moves. When switching forms, the old signature move is removed and the new one, if any, is learned immediately. In a secret room in the Galactic Eterna Building, accessible only with a Secret Key, there are appliances that can be used to switch between forms.
11	492	Forms have different stats and movepools. After using Gracidea, Sky form will be active during daytime; otherwise, only Land form is active. Gracidea only works on an official event Shaymin.
12	493	Form always reflects type, which may be changed by attaching a Plate and activating Multitype.