Like jc104 said, RP Terrakion is usually the better choice so you need to say the difference and advantages. Here are some he did not list.
- Can get past Gliscor
- Isnt weak to Scizor's bullet punch
- Isn't walled by Gastrodon
- Isn't weak to Rain Teams as much
- Rain cancels out Lucario's fire type weakness
- better typing
- doesnt have to rely on stone miss (jc104 said that)
Also change the EVs so that you will recieve 526 speed after the boost to outpace the fastest scarfer in OU. invest the rest in bulk. late game will have anything faster removed
PM or VM me for an OU or RU Rate!