Charmander-charmeleon-charizard.
Thats because im really the old guard of it. Poorly remember the gold/silver playthrough, barely remember the ruby/sapphire one and never played anything after that
I got Red Blue and Yellow for my 8th Christmas. Silver and Gold a year or two later.
Fought wanting Ruby/Sapphire when I was like 13 because, "Too Old for Pokemon" I thought. Wound up asking for Ruby anyway.
Leafgreen next, due to not knowing that in JP it was Red and Green versions first in Japan.
Got Pearl when I was 17. Decided the franchise was sorta going downhill.
Picked up Pokemon White for something to do though, while I was in the Navy. Thought, "Hey they're turning this ship around!"
Then Pokemon X was ok. :/ Then got and tried Sun... still haven't finished it. No amount of thicc hawt islander not-gym gym leaders are gonna get me invested. Neither is Nebbie in the bag. *sigh*