The best replacement for flat foot is arched foot.

The best alternatives to flat foot are rated as following:
★★★★★  arched foot
★★★★  normal foot
★★★  high arch
★★★  arch foot
★  curve foot

Your alternative for flat foot is not listed? Suggest!
Speaking about flat foot, one probably shouldn't forget about supination.

Other search terms related to flat foot and their ratings are:
★★★★★ supination
★★★ underpronation
You have in mind a companion for flat foot and it is not yet here? Propose!



Google Trends

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flat foot
arched foot
normal foot