You cannot evolve a Legendary Pokemon, if you could it wouldn't be even considered a Legendary Pokemon. It would be just considered a rare original Pokemon.
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legendary Pokemon don't evolve into/from anything. Without GameShark,no Pokemon can evolve into a legendary.
Groudon is a legendary Pokemon and so far none of the legendary Pokemon can evolve. (That would be cool if it could but it can't)
Gible: A dragon/ground Pokemon that evolves into GabiteGabite: A dragon/ground Pokemon that evolves from Gible and can evolve into GarchompGarchomp: A dragon/ground Pokemon that evolves from GabiteDialga: A steel/dragon Pokemon that does not evolve; this is a "Legendary Pokemon"Palkia: A water/dragon Pokemon that does not evolve; this is a "Legendary Pokemon"Giratina: A ghost/dragon Pokemon that does not evolve; this is a "Legendary Pokemon" hope this helpswhiteless
Kyogre is a legendary pokemon, so it doesn't evolve.
volcarona may not be considered to be a legendary as it does infact evolve from a Pokemon called larvesta, but the Pokemon volcarona is considered to be a legendary Pokemon.