You'll need to trade for it, because it isn't in the Pokemon Emerald.
To catch it, you must mix records with Ruby or Sapphire.
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Wait until the TV in the game tells you there's an outbreak of surskit go to the route they mention to catch one. If your having a hard time get one from ruby, sapphire or xd gale of darkness.
You can find Surskit at route 102 and 114, however it is pretty rare because its catch rate is only 1%. You can also find it at route 117 when you hear there's a swarm of them on TV.
You actually find surskit in the grass not in water.
Evolve Surskit.
Surskit is NOT catchable in Emerald. Trade from Ruby/Sapphire.Of course you can get a surskit: just run around in the grass at rout 102. They're kinda rare though.