First what you need to do is beat the Pokemon League Championships.
Then what you need to do is capture ALL (yes, all of them) Pokemon in the game. (huge pain i know)
Then you need to talk to Professor Oak and you should get one of the Jhoto league starters.
I'm not quite sure if its based on the starter you picked or if you get to choose.
I hope it helps! This is false you do that in emerald! To get Typhlosion you need to get the purified quilava from Pokemon colosseum or cyndaquil from Pokemon xd gale of darkness then just train it to level 36 to evolve it to Typhlosion.
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A Quilava will evolve into a Typhlosion at 36.
Yes, the easiest way is with another typhlosion or with a ditto.
Of course, Typhlosion`s a fire type and Meganium is a grass type, plus Typhlosion can learn Shodow claw how I know? My Typhlosion, Blaze knows it.
The best place to train typhlosion is Route 26 in The Kanto regoin.
you have to give typhlosion a TM Earthquake Hopes this helped :-D