The best replacement for metal sonic is shadow.

The best alternatives to metal sonic are rated as following:
★★★★★  shadow
★★★★★  sonic
★★★  mecha sonic
★★★  metal mario
★★★  bass
★★★  tails doll
★★  metal shadow
★★  shard
★  sonic exe
★  silver sonic
★  yoshi
★  shadow android
★  mephiles
  super sonic
  sonic the werehog
  metal sonic 3.0
  metal knuckles
  rainbow dash

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metal sonic
shadow
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