I need it for my Thyplosion in competetive play. Thankyou for your help.
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At Route 13, Terminus Cave and by using Eruption, Heat Wave or Lava Plume when there is a round rock behind the opponent (in case you didn’t know this is a new thing introduced in X and Y that you can learn more abouthere).
http://bulbapedia.bulbagarden.net/wiki/In-battle_effect_item#Condition_boosters
I have tons ofHeat Rocks. The way I got them wasEVtraining for Speed onRoute 8and a lot of the times when I’d defeat a hoard ofWingullI’d get aHeat Rockfot it at the end. A message pops up at the end of the battle after you get theEXPso check your bag afterwards.
Grab a Pokemon withSweet Scentand another withHeat Waveyou need it in order for this to work. Head toRoute 8and defeat hoards ofWingulluntil you get it. It shouldn’t take long at all.
There’s also some other items you find in battle with unique moves.Source.