Definitely, I'm planning to do that with my hundo. It's just a pitty that DT performs so poorly in PvP... Rayquaza and Dragonite manage so-so to be good at it thanks to STAB and their attack stats, but Milotic doesn't really cut it. I believe Waterfall is an overall better move for PvP if you account for STAB, but that's just my little experience with it.
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2 charge moves for Milotic
I have a Milotic sitting on 2499 CP and with DT and Blizzard, I have the candy and star dust so would it be worth investing in a second charge move such as surf?