Hi Bhoot, nice team, and I love Riolu!
First off, I would suggest Skarmory over Forretress because it can switch in constantly and heal itself with Roost. It has the same defense and fills the same role as Forry. Here is the set:
Skarmory@Shed Shell
Ability:Sturdy
252 HP, 232 Def, 24 Spe...