The best replacement for codebreaker is gameshark.

The best alternatives to codebreaker are rated as following:
★★★★★  gameshark
★★★★★  action replay
★★  action replay max

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Speaking about codebreaker, one probably shouldn't forget about swap magic.

Other search terms related to codebreaker and their ratings are:
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★★★★ opl
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★★ free mcboot
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codebreaker
gameshark
action replay