If you are talking about the very last, Blue is on Cinnabar Island. You have to get all seven other Kanto badges in order for Blue to go back to his gym. If you show him all the badges, he will head back to his Viridian City gym.
First after groudon and kyogre has awakened by magma and aqua you must awakened rayquaza too at the sky pillar then go to sotopolis and after the incident is over you can go to the last gym leader
in viridian city. to get to him you have to beat all the gym leaders. you also have to beat the Rockets at Silph Co in Saffron City and at the Hideout in Celodon City i think
In blackthorn city
ponie
Their is no last gym leader the show will never end. well in the show right now? Volkner is going to be the last gym leader.
You have to defeat the gym leader in that town.
gym leader volkner in sunyshore city
I think it is blaine and he uses fire pokes Hope it helped!!
In the first city
blue in viridian city
you can take on any gym leader in kanto in any order (excluding blue you have to battle him last)
first get a ice type Pokemon then go threw the whole gym face gym leader and get the badge
To get to Blaine, he is on cinnabar, but the last gym leader... He is in one of the towns once you defeat Blaine, I think it was Viridian or Vermillion. =)
you must frist go to seafoam island where blaine is, he is the 15th gym leader, then go to cinnibar island and a character who is behind the Pokemon center will then say that he is the last gym leader, once you have talked to him he will go to viridian city gym, he is the last gym leader. this is for heartgold and soulsilver :) hope this helped.
In Pokémon HeartGold, you can find the 3rd Gym Leader in Goldenrod City.
no you can not become a gym leader in any game.
Gym Leader Blue
You have to battle the last gym leader Blue in viridian city in kanto reigion.
If you are referring to Clair (the last Gym Leader of the main story) she uses Dragon-types. If you are referring to Blue (the last Gym Leader of the Kanto region post-main story) he doesn't use any one type in particular.
The 14 gym leader in heart gold is in Saffron City.