Shaymin - Pokedex Guide - IGN

The Gracidea flower required for Shaymin to change forms is given by a woman in the Lacunosa Town Pokémon Center in Black/White, and in the Striaton City

Shaymin - New Pokemon Snap Guide - IGN

Pokémon Sword & Shield Pokédex •

Dolliv - Pokemon Scarlet and Violet Guide - IGN

Pokémon Sword & Shield Pokédex •

PokeMMO Ability Index - Guide Tavern - PokeMMO

Shaymin (Pokémon) - Bulbapedia, the community-driven Pokémon

Shaymin - Pokemon GO Guide - IGN

Shaymin - New Pokemon Snap Guide - IGN

Shaymin, International Pokédex Wiki

Only relying on GTS, Pokemon Go and Pokemon Shield, these are the