There's quite a few: Altaria, Bagon, Shellgon, Salamence, Vibrava, Flygon, Kingdra (but you need to trade Seadra with dragon scale), Latios/Latias, Rayquaza.
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I don't think dragon pulse is in Pokemon emerald, sorry.
The strongest dragon type in pokemon Emerald, Sapphire and Ruby, is the legendary pokemon Rayquaza. In terms of non-legendary pokemon, both salamance and flygon are strong dragon types.
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The Dragonscale is an item in Pokemon Emerald version. There is a chance that certain Pokemon such a Horsea will be holding one when you catch it.
Dragon and Ice types are super effective.