Psychic(Gallade)is weak to Umbreon and Gengar.
You shouldn't get a Pokemon which has 2 weakness pokemons.
That means a Pokemon's type is one of the weakness of a/another Pokemon.
Charizard and Salemence is good for Sp.Att...
Heracross is good for Sp.Def.../Defense...
Umbreon and Gengar is good for Speed.
You should train Heracross for Speed,Eviaveness(Sorry if my spelling's wrong but I haven't played my Nintendo DS Lite for a long time.(And Its Pokemon Pearl.)Accuracy and Sp.Att./Attack..too..
If that Gallade has Psycho Cut and Focus Punch it'll be great!
I would like to suggest that you should change the Gengar to Giratina?If not then Raichu?
Gamma8,Zorbak
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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.
These are the Pokemon who can mega evolve in X, Y, Omega Ruby, and Alpha Sapphire: Venusaur, Charizard, Blastoise, Alakazam, Gengar, Kangaskhan, Pinsir, Gyarados, Aerodactyl, Mewtwo, Ampharos, Scizor, Heracross, Houndoom, Tyranitar, Blaziken, Gardevoir, Mawile, Aggron, Medicham, Manectric, Banette, Absol, Garchomp, Lucario, and Abombasnow. Only in Pokemon Omega Ruby and Alpha Sapphire: Beedrill, Pidgeot, Slowbro, Steelix, Sceptile, Swampert, Sableye Sharpedo, Camerupt, Altaria, Glalie, Salamence, Metagross, Latias, Latios, Rayquaza, Lopunny, Gallade, Audino, and Diancie. These Pokemon are considered Primal and do not fall into the Mega Evolution category completely: Kyogre and Groudon.
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.
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.