Yes it will. Your Arceus will still learn Draco Meteor when it changes its form. The only thing that changes is Judgement's type.
>Draco Meteor can only be tutored to Dragon-type Pokémon (with the exception of Arceus, which can learn it regardless of which Plate it's holding).
Realize this is old, but I feel like someone should point out that your source (and every other source I've seen) says that Arceus must be holding the Draco Plate to learn the move.
commented 12 hours ago by Thea_Queen
There you have it!