I think that Natu should be C Rank because it is an excellent supporter with its ability in Magic Bounce. On the team that I was experimenting with in NU before I got perma-banned, Natu was an excellent at just reflecting Spikes, Toxic, and Taunt, and has no problems healing off Rock Blast from Garbodor. Also, Natu can just heal off Gunk Shot or Rock Blast with Roost. This is the personal set I have been using:
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Natu @ Eviolite
Trait: Magic Bounce
EVs: 248 HP / 252 Def / 8 SDef
Bold Nature
- Roost
- Thunder Wave / Toxic
- Reflect / Night Shade
- U-Turn