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This form
Event only
A one-off gift in Pokémon HOME for completing its National Pokédex; it is not found in any game through normal play.
Whether this form can be shiny is unknown.
Researched, awaiting review · pokemondb.net
Where to catch it
0 games
Original Magearna has only come from events, so there is nowhere to catch it.
Missing a way to catch it? Suggest an encounter