No, in order to evolve a feebas there are 2 ways
1. Evolve it with maximum beauty
2. Trade it while holding the Prism scale
Also A clampearl will evolve into Huntail while holding The DSC
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To evolve it, you have to give it a Deep Sea Tooth (Huntail) or a Deep Sea Scale (Gorebyss) and trade it.
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.
When you trade Clamperl with the deep sea scale you get Gorebyss with the deep sea tooth you get Huntail.
You can find the Deep Sea Scale and the Deep Sea Tooth on Routes 13 and 17.
i do not know how to get deep sea scale but if you catch a carvanha in D/P or platinum there is a 5% Chance of getting a deep sea tooth