The best replacement for supersonic is hypersonic.

The best alternatives to supersonic are rated as following:
★★★★★  hypersonic
★★★★  subsonic
★★  ultrasonic
★★  deluxe reverb
★★  confuse ray
★★  subsonic ammo
★★  fergalicious
★★  sunburn
★★  stun spore
★  luv injection
★  king addies
★  confusion
★  supershadow
★  addies
★  hyper shadow
  subsonic ammunition
  hyper knuckles
  supersonic

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