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>Mega Sinnoh Starters happen, Infernape gets Moxie, Torterra gets Solid Rock, Empoleon gets Competitive
>Cyrus gets Mega Weavile, mostly speed-orientated but with Tough Claws.
>Cynthia gets a second Mega Evolution for her Garchomp; closer to a Megagross/Megamence situation where the attack boost is low, but speed, bulk and/or special attack get boosts in return. Ability is Strong Jaw, due to the shark elements.
>'Cosmic Evolutions' is the special kind of Mega Evolution introduced for Dialga, Palkia and Giratina. All get new abilities relating to their individual theme.
>Mostly follows the Platinum storyline, but the Spear Pillar event is still only using Dialga or Palkia, depending on the version. Cyrus is still around afterwards, however, and teams up with Charon to make another attempt at recreating the universe by summoning Arceus in a post-game quest similar to the Delta Episode. Giratina emerges to drag both Cyrus and Arceus into the Distortion World, and becomes the obligatory mandated capture before Cosmic-Evolving so that you can fight and capture Arceus. Cyrus stays in the Distortion World, and the aftermath is the aftermath of Platinum's Heatran quest.
>The Underground returns, but with expansions and more benefits and things to do.
>Battle Zone area gets expanded, we get to go further north into a small area of Poke-Russia, where you can find the Golems, amongst other things.
>Regigigas gets a Primal Reversion at long last, and a new ability that gives it damage bonuses on and resistances to Ice, Rock and Steel-type attacks. Stats are given balanced boosts all around, but it gets a reasonable boost to Special Attack because of how high everything else is already.