It has been shown on numerous occasions that there are certain Devil Fruits that can counter other Devil Fruits:
Gomu Gomu no Mi > Goro Goro no Mi
Doru Doru no Mi > Doku Doku no Mi
Magu Magu no Mi > Mera Mera no Mi
So I'm wondering if there are any other counters to Devil Fruits. This will be fun.
Here's what I thought up:
Doa Doa no Mi > Bari Bari no Mi
Toge Toge no Mi > Hana Hana no Mi