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Kecleon has an "Ability 2" called False Colors.
There is a Chocolate Pokemon that almost looks like Ditto, with Gooey ability. Alola residents report that its edible, but Trainers that get a taste of its body no
longer desire to eat.
Pancham has a split evolution line. At level 32 it can evolve into Pangoro with a Dark type in your party, or you can evolve it into Pancare
at level 32 by trading it with any Pokemon that has False Colors ability. At the moment only 2 of them have it that I can recall, a little fairy and Kecleon.
Synchro Evolution enables certain Pokemon to use a special 5th move during battle. This move is interchangable, and STAB benefited. Not every Pokemon has a Synchro Move.
Example's of this I've seen were Electric Beam Pikachu and Monster Ball Snorlax.
Synchro Mega Evolution (SME) is when your Pokemon bonds with both Synchro Gem + Mega Stone, enabling them to Mega Evolve and use their special 5th move. Example's of
this I've seen were Sludge Wave Gengar, Draco Meteor Ampharos, and Seed Flare Venusaur.
There are 17 new mega evolutions. Six of them will be revealed in the September issue of Corocoro (Greninja, Hydreigon, Weavile, Slowking, Bellossom, & Golurk) whilst
2 of them will be revealed at this year's World's ceremony (Mega Lanturn, exclusive to Moon, and Mega Sunflora, exclusive to Sun).
No Kalos post game, and no new eeveelutions.
Pokemon Kanaka is a feature that allows you to traverse through a particular island quicker using a Tauros, Arcanine, Scolipede, Stoutland, Rhyhorn, Donphan, and Gogoat.
Several Pokemon have surfing models, including Sharpedo + Wailord.
Soaring makes a return but is limited to only both Lati's + Rayquaza.
S.S. Constellation helps us to traverse to different islands. Post-game we can board it to go to the Kalola District, where strong trainers + a battle maison await us.
On this particular island there is a Statue of a huge man (AZ) that visited Alola before.