It must be traded while holding deepseatooth or deepseascale.
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Clamperl is a Water type pokemon.
The only way to get Clamperl is to go to the trading center in Jublife city.
Unfortunately Clamperl doesn't evolve through leveling-up for some unknown reason. However, it does evolve, and that happens through means of holding certain items when traded. Clamperl>Huntail when Clamperl is Holding Deepseatooth when traded Clamperl>Gorebyss (ugly sod) when Clamperl is holding Deepseascale when traded. I recommend Huntail, if you're thinking of choosing. I recommemd choosing, if you haven't thought of choosing.
Give the deepseascale to clamperl and trade and trade back and it will evolve into a huntail. Give the deepseascale to clamperl, trade and trade back and it will evolve into a huntail.
You must have a clamperl and let it hold the deepseatooth/deepseascale. Then, trade clamperl. If clamperl is holding the deepseatooth,it will evolve to Huntail. If it was deepseascale, it will evolve to a Gorebyss.