@lina
roca has 2 fire skills, one that attacks 2 target yes. the other is not wind type but non-elemental like bloodsuck and killer js
a good pk pet is a speedy pet which normally are wind types so I would go for Clive or Hayate. Hayate has much more stat and have a 2-target skill. clive on the other hand can hit 4. for damage, you can go for roca or vic