OK - I looked at your team and I was debating if Cottonee or Wynaut would belong over Magnemite as Red had suggested.
Wynaut: definitely not. Wynaut is supposed to be used as a defensive pivot for offensive teams, and really doesn't belong on the balanced team you have.
Cottonee: I'm going to say no to Cottonee simply because you only have one true check to Ferrroseed if you replace Magnemite, and that'd be Timburr since Lileep lacks HP Fire. Cottonee does perform well against Ferroseed, but you would open yourself up to Taillow.
tl;dr: keep magnemite
Wynaut: definitely not. Wynaut is supposed to be used as a defensive pivot for offensive teams, and really doesn't belong on the balanced team you have.
Cottonee: I'm going to say no to Cottonee simply because you only have one true check to Ferrroseed if you replace Magnemite, and that'd be Timburr since Lileep lacks HP Fire. Cottonee does perform well against Ferroseed, but you would open yourself up to Taillow.
tl;dr: keep magnemite