>>47743933gen 5 started gym leaders having only 3 pokemon at most
gen 5 started the elite four having only 4 pokemon
gen 5 started rivals handing you constant free healing items
gen 5 started free lucky egg
gen 5 started putting a chansey expy in every route
gen 5 started doctors in every dungeon area
gen 5 started making the region a straight path to prevent people from not knowing how to progress
gen 5 started npcs explaining mechanics to you even when you tell them not to explain mechanics to you
gen 5 started poison not damaging you in the overworld anymore
gen 5 started giving you a gift pokemon specifically to deal with a type disadvantage against the gym leader
gen 5 removed auto running
gen 5 removed contests
gen 5 removed secret bases
gen 5 removed berry planting
gen 5 removed ribbons