Originally Posted by Fat pokemon0078
You need 30 IVs in HP and no HP EVs so that Petaya activates with 3 Substitutes and full health. Otherwise, this looks good, SubPetaya Sceptile is good stuff.
Make sure you mention that the IV spread is 30 HP / 30 Atk / 30 Def
for a perfect Hidden Power Ice. If you're smart and want to minimize random confusion and/or Foul Play damage, 30 HP / 2 Atk / 30 Def
also works for a 70 BP HP[Ice].