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Make the game semi-open world, in how in gen 1 after surge you could fight 4-7 in any order.
Side quests that showcases newer pokemon.
Ex. A hex girl needs her Pumpkaboo to evolve but, she also needs a trevenant so you catch a phantump and trade.
Hard mode option
Battle frontiers
Give every game the platinum treatment
make legendaries secret/hard to catch like in the older games.
rematches
amie
balance the type chart (thats the most unrealistic thing)
battle damage visit a Pokemon center and potions get rid of these
field destruction like using flamethrower in the woods can damage trees
Or you can't use dig in the ocean
Also pokemon will only appear under certain conditions and seasons
