Swampert on CD

If I wait for CD can I change my swampert to Hidro Cannon with Normal TM’s?
Or maybe if a Bought the second charged attack will it come as hidro cannon?
I’ve got 98% lucky Swampert that I evolved before CD became a thing.

Welcome @Sandsmesh! The only way to get legacy moves (such as Hydro Cannon) is to either use an elite TM or to evolve it during its community day. So for Swampert, you need to evolve it on the CD or use an ETM.

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You can evolve your Marshtomp this December’s CD to get Hydro Cannon Swampert.