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You missed the chance to use Dialga before, so I figured I'd throw in his brother (who's typing I personally don't like... I just can't imagine a Water/Dragon being any good (GYRADOS WILL NEVER BE WATER/DRAGON!)).
Water/Dragon only has one weakness, and that one weakness only does 2x damage. Just like with Poison/Dark :D If Gyara became Water/Dragon, it would lose the 4x Electric weakness and Rock weakness and just have a weakness to Dragon, thus making it even more hard to take down.