trade a ralts for a seedot in rustboro at the house next to gym
trade a volbeat for a plusle in fortree
trade a bagon for a horsea in pacifidlog in house south of Pokemon center
trade a skitty for a meowth in the battle frontier in a house next to the battle tower
that's all of them, sadly
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The first in game trade is in Rustboro City in Ruby or Sapphire you would trade for a Makuhita, however, in Emerald you can trade for a Ralts. NOTE - ALL OF THE EMERALD TRADES ARE BAD DEALS!
You can't normally get Squirtle in Pokemon Ruby. If you used a game hacking device to obtain one, maybe Pokemon Emerald was able to detect that? Emerald also refuses trades until you've obtained the Running Shoes, though that happens so early in the game it's probably not what's wrong in this case.
there is no contest house in Pokemon emerald
I don't remember... I lost my Pokemon Emerald Game.
Dialga is not in that Pokemon Emerald. Back when that game was made, Dialga didn't exist.