Latios or Altaria for ingame Team? (ORAS)?

Question

Having Swampert, Gardevoir, Delcatty, Manectric and Roserade as teammates

Comments

Why are you using Delcatty when there are so many better normal Pokemon like Swellow and Zangoose?

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Ok, this might sound stupid but I need the Delcatty for contests.(Cute)

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Delcatty's bloody useless in battle so you're better off dumping it now and only using it for, well, contests.
There are generally better options by now such as swellow, zangoose, or banette

Answer 1

Latios. You don't have a flyer, and if you have Latios, you don't need Fly as you have the Eon Flute.

Comments

This, is partially incorrect, since  you get the eon flute after defeating groudon and kyogre, although I agree latios is better

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Hell, you could even Surf with Latios and just give Swamp Waterfall.