You cannot get Gallade in Pokemon Emerald. He can only be obtained in Diamond and Pearl by evolving a male Kirlia via a Dawn Stone.
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Dawn stone on pearl/diamond/platinum
You cannot get a Gallade on Pokemon Ruby. But you may get one in Pokemon Diamond or Pokemon Pearl. - Badminton
Gallade is both a fighting and psychic type Pokemon. Rock, ghost, dark, grass, and poison Pokemon can be weak against Gallade.
Gallade is a evolved form of Kirlia (Evolved form of Ralts) but has to be a boy Kirlia. If it is, then you can evolve it with a Dawn Stone, and it will be a Gallade.
its not an emerald its RAYQUAZA the main legendary Pokemon in Pokemon emerald.