The best replacement for renamon is guilmon.

The best alternatives to renamon are rated as following:
★★★★★  guilmon
★★★★★  lucario
★★  krystal
★  renamon
★  patamon
  terriermon
  gatomon

Your alternative for renamon is not listed? Suggest!
Speaking about renamon, one probably shouldn't forget about rika.

Other search terms related to renamon and their ratings are:
★★★★★ rika
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Google Trends

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renamon
guilmon
lucario