To rematch the Gym Leaders, you must first obtain their phone numbers.
Falkner: On a Monday, go to the Celadon Department Store. He will be on the fourth floor. Talk to him to get his phone number. Then, call him on a Saturday morning to schedule a rematch.
Bugsy: On a Thursday, go to the Viridian Forest. He will be near the south entrance. Call him on a Thursday afternoon to schedule a rematch.
Whitney: At twelve o' clock to four o' clock any day of the week, go to the sixth floor of the Goldenrod Department Store. Call her on a Saturday afternoon to schedule a rematch.
Morty: On a Monday, go to the Bellchime Path. Call him on a Tuesday night to schedule a rematch.
Chuck: Talk to his wife, who stands outside of his Gym. Call him on a Wednesday night to schedule a rematch.
Jasmine: On any day from one o'clock to two o'clock, go to the Olivine Cafe. Call her on a Wednesday afternoon to schedule a rematch.
Pryce: Go to the Lake of Rage any day from six o'clock A.M. to ten o'clock A.M. Call him on a Monday morning to schedule a rematch.
Clair: Go to the Dragon's Den any day from six o'clock A.M. to ten o'clock A.M. Call her on a Friday night to schedule a rematch.
Brock: Go to Diglett's Cave any day from noon to three o'clock P.M. Call him on a Saturday night to schedule a rematch.
Misty: Go to the cape on Route 25 any day from four o'clock P.M. to six o'clock P.M. Call her on a Wednesday morning to schedule a rematch.
Lieutenant Surge: Go to the Power Plant any day from nine o'clock A.M. to noon. Call him on a Friday morning to schedule a rematch.
Erika: Go to Celadon City's fountain on a Sunday from three o'clock P.M. to five o'clock P.M. Call her on a Sunday to schedule a rematch.
Janine: Go to the gate to Victory Road any day from four o'clock P.M. to six o'clock P.M. Call her on a Monday afternoon to schedule a rematch
Sabrina: On a Friday, go to the Olivine City Harbor. Call her on a Sunday afternoon to schedule a rematch.
Blaine: On a Tuesday, go to Cinnabar Island. Call him on a Tuesday afternoon to schedule a rematch.
Blue: Show a Pokemon with full happiness to Daisy in Pallet Town after she has massaged your Pokemon five times. Call him on a Sunday night to schedule a rematch.
The Gym Leaders will battle you at the Dojo in Saffron City.
On eather game, sadly, you can't. But on Diamond, Pearl, Platinum, Heartgold and Soulsilver you can...
I heard the walkthroughs from youtube but you can't
i am not sure but i think it is 12247daa 00004801 02247dac e0021c39 02247db0 000001ab d2000000 00000000
you can't but after you go through Stark Mountain and reach the Survival area at the club you can rematch theminside
Unfortunately, you cannot. Once you defeat them, you cannot have a rematch. However, if you want a better challenge, you could rematch the Elite Four. They will definitely level up your Pokemon.
Well There is no way to rematch the gym leaders unless if you hack it!
On eather game, sadly, you can't. But on Diamond, Pearl, Platinum, Heartgold and Soulsilver you can...
You cannot.
Hackless, NO!
You cannot.
No, you don't. You cannot face the Sinnoh Gym Leaders in HeartGold.
No, this feature is only available in Pokemon Emerald.
I heard the walkthroughs from youtube but you can't
i am not sure but i think it is 12247daa 00004801 02247dac e0021c39 02247db0 000001ab d2000000 00000000
Walk in and save the game then go in and in out
Beat the rest of the gym leaders first.
You cannot travel to the Hoenn region in Pokemon Heartgold and Soulsilver.