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Most of the signature features from each gen
> cruise liner
> secret bases
> following pokemon
> pokemon that you can ride
> a small chance to encounter wild hidden ability pokemon
> gym rematches with full teams and occasional megas
> battle facilities like frontier and the pwt
> on a daily basis one or two randomly selected gym leaders, champions and important npc from other regions can be found visiting kalos or the battle chateau, they offer you a battle with full teams
> trainers can be randomly rematached as well
> 2d graphics for trainers you battle instead of 3d animations
> alexa and viola can be challenged in doubles as couple during weekends
> ramos is no longer gym leader but can be found and challenged as side quest, he is now replaced by one of his relatives, either a young male trainer or female one
> bonnie is part of the lumiose city gym, no longer a quiz host, has to be defeated before clemont, uses a full team of electric mascots only
> drasna is the draco meteor tutor, must be defeated everytime you want to teach a pokemon this move to see if your pokemon is worthy of it
> drasna's e4 position is now taken by sina & dexio, first e4 double battle, they use dragon or normal type pokemon, each one uses a specific type
> diantha is no longer a champion, is a side quest battle that can be repeated
> the champion is now a completely new character, team is still mostly mixed, actually has a decent type coverage and an improved AI
> each day a npc offers you to trade it a random pokemon for its randomly selected vivillon pattern (the npc can be viola too)
> new character customization
> zygarde get's either two new forms or two new megas
> kalos minor trio can be found in the postgame
> new locations, apparently the region map of kalos has some free areas that can be updated
