>>51008086in RSE they added natures (+10% to one stat and -10% to another; if they are the same stat then it cancels out and does nothing) and abilities (always-on passive abilities, every pokemon has one, some species have 2 and an individual of that species may have either of them), and replaced the stat XP and DV systems with EV's and IV's
in gen 4 they split physical and special moves on a move-by-move basis instead of by type
in gen 5 they added hidden abilities (a third, rare ability that's not available on normal wild pokemon), added the shiny charm, and also introduced a weird XP formula that's never used again
in gen 6 they added the Fairy type, doubled the base shiny rate, made exp. share give full XP to your entire party, made catching pokemon give XP, added ability capsules to change your pokemon's ability, added mega evolution, and let you pet your pokemon on the touch screen
in gen 7 they removed the national dex and added hyper training (can set a pokemon's IV to max) and added Z-moves
in gen 8 they made it so you can't transfer all pokemon from previous games, added mints (can change a pokemon's nature), added ability patches (can change a pokemon to have its hidden ability), removed mega evolution, removed Z-moves, and added dynamax
>Is Typhlosion still based?Yes.