I'd say as a whole Gen 5 had much stronger gyms than either 4 or 6, there were simply stronger Pokemon or stronger moves flying around (Leonra's Watchog is a very huge filter for example, not to mention other stuff like Ghetsis) versus Gen 6 which is probably the easiest Pokemon game minus SWSH, and Gen 4 which is absolute cake because of how strong the starters are and the obligatory Staraptor breaking the game in half with Close Combat, meaning the only fight that'll give you pushback is Cyntha.
>>54686854That's because Gen 5 had long as fuck routes, also good selective memory, Gens 2, 3 and 4 all had random rest houses on various routes as well, the Doctors in Unova just made it so you didn't need to haul ass to a Pokecenter every 3 minutes as you tackle a fuckhuge area like Desort Resort that had like 15 trainers in perma sandstorm.