you simply defeat the gym leaders in the johto and kanto regions
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Mt Silver.
Try looking in mt silver.
You can Magmar at the Burned Tower. Go to Kanto ,after beating the Elite Four, Magmar will also spawn in the Mt. Silver.
It can't be found in Pokemon Gold or Silver. Only in Crystal, where can teach your Pokemon Flamethrower by finding the Move Tutor outside Mt. Silver on Saturdays and Wednesdays after you have defeated the Elite Four. It can be found in Heartgold and Soul Silver as well.
Go find Prof. Oak, then he will give you access to Mt. Silver. It's located beside the entrance of Indigo Pleateau (if you took notice, previously there'll be a guard blocking you). There locates your destination, Mt. Silver. Pokemon Trainer Red is at the top of Mt. Silver, so prepare to fight the strongest trainer in all Pokemon history!