The best replacement for gameboy advance is sp.

The best alternatives to gameboy advance are rated as following:
★★★★★  sp
★★★★★  gameboy advance sp
★★★★  nintendo ds
★★★  ds
★★★  gameboy color
★★  gameboy micro
★  snes
★  super nintendo
★  advance sp
  gameboy
  ds lite
  gameboy sp
  gameboy ds

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Speaking about gameboy advance, one probably shouldn't forget about gamecube.

Other search terms related to gameboy advance and their ratings are:
★★★★★ gamecube
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gameboy advance
sp
gameboy advance sp