Naive is fine - it's just a sub optimal EXKiller. Use the standard EXKiller set and you'll be good.
Unless you're talking about whether or not Naive has any competitive use or reason? If that's the case - no. Mixed Arceus is the only thing Naive would go well with and you shouldn't used Mixed Arceus if you're trying to be serious.
commented 58 minutes ago by PX
If you're trying to run an effective Ekiller you should use the standard one - though I must admit that variant looks kind of fun. I like the idea of just poppin Zygardes and hitting Giratina's on it's weaker side.
commented 8 minutes ago by PX