Looking into some move set changes on Serebii. Looks like the "Uber" 'mans are getting a serious leg up over their already insane power.
-Ho-oh and Lugia both get Weather Ball, and Ho-oh also gets Brave Bird (YES!). Lugia gets......Dragon Rush.
-Kyogre gets Aqua Ring and Muddy Water, just in case the complete water stacking overkill bulk monstrocity didn't [acid burst] you off enough.
-Groudon finally Lava Plumes, which will make for a world of hurt with a Flash Fire partner. He also gets Hammer Arm. Ouch.
-The new moves for 4th-gen's legendary dragons are not exclusive to Arceus-made ones, they're part of the normal HG/SS level up. So, yeah, enjoy a lot of Metal Bursting Dialgas.
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