It all depends on your starter. You dont want 2 of the same type in a party. Some of mine were:
Blue version-Blastoise, Aerodactyl, Sandslash, Haunter, Magmar, and Golduck (for payday)
Sapphire-Blaziken, Pelliper, Kyogre, Raquaza, Vileploom, and Relicanth
Emerald-Swampert, Electrode (speedy), Swellow, Raquaza, Groudon, and Kyogre
Diamond-Infernape, Staraptor, Floatzel, Electrode, Dialga,and Azelf

I would also reccomend having a variety of moves.

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My card!!!
Some of it is my main team, but are due to change.