The legendary Pokemon in Pokemon sapphire are groudon, rayquaza, Kyogre, Regice, Regirock and registeel
EDIT: No you cannot unlock/get Groudon, Rayquaza, or the Regi's.
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IF YOUR ASKING IF YOU CAN RECRUIT LEGENDARY POKEMON IN THIS GAME YES YOU CAN BUT YOUR TEAM HAS 2 BE A SIZE 2 IN ORDER 2 RECRUIT A LEGENDARY POKMON WHO IS A SIZE 4 WHICH EQUALS 6..GLAD 2 ANSWER...VERONICA
an event from new york.
You find it in the team aqua hideout.
TRADE IT FROM RUBY OR SAPHIRE.
trade 2 ruby/saphire