Because that wasn't even the reason they brought back Charizard.
Seriously Cyber? You'd like to see a little dragon get pwned by an anger-management issues dragon instead of a good fair fight?
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Because it didn't.
There's really no reason to make a thread about this. This is the writer's show, they decide what happens, and they decided to bring back Charizard(It really shouldn't be that hard to see why). What you think "should" have happened is irrelevant.