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>primal dialga looks exactly like PMD primal dialga
>walking pokemon brought back (hidden animations in SM)
>new z-moves for sinnoh starters among other pokemon
>eternal diamond and infinite pearl
>ride pokemon finally remove the need to shit up your team with HMs or have a HM slave to traverse sinnoh
>battle area, survival area, and resort area still exist but the entire frontier is replaced with le epic tree of skill :^) like ORAS battle frontier and maison
>trials are forgotten about forever
>giratina/arceus/darkrai postgame mission where you can catch it
>lucas and dawn get redesigns (hence them not being featured in pokemon origins) but most characters remain the same
>underground neutered and a shadow of its former self
>pokemon contests simplified and casualized like in ORAS
>cynthia gets m-chomp, rest of elite four gets megas after becoming champ, aaron: m-heracross, bertha: replaces one of her team members for one that can mega (probably steelix), flint: m-houndoom, and lucian: m-alakazam