Hi, just wanted to say: great question! I loved it a lot, so I decided to test it out on PS! along with other mechanics as well, like Arena Trap.
So if you're okay with that as a source for my answer, my observations stand thus:
- EQ hits Rotom Fan.
- Arena Trap affects Rotom Fan
- Mold Breaker EQ hits Rotom Fan
tl;dr: Iron Ball sux. It makes it lose both ability and type advantage.