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Roar of Time
Deals damage. Provided the move hits, the user must recharge the following turn, and may not attack or switch.
"Dragon-type Hyper Beam" is just about all that needs to be said. There are plenty of other great Dragon-type moves out there, such as Draco Meteor and Dragon Pulse. Stick to one of them and leave this unimpressive signature move behind; your Dialga will thank you.
Dragon Pulse is an alternative with 90 Base Power and has no recharge period.
Draco Meteor is an alternative with 140 Base Power that has no recharge period, but lowers the user's Special Attack two stages.