I agree with you electrocute but still considering the idea its really a good one so maybe after giving some thoughts a better outcome is possible with is satisfying and not too OP.
For instance, we can increase the cost of the item or make it a 24 hrs. item with 25c coin price then it wouldn't be too bad and if still it isn't good then we can give some handicap to syncability like making it 35-40% sync rate after using this item that wouldn't be too bad either.
Also after reading some more comments and other people's thoughts i got another better idea that this Green MS thing may not work for natures but for abilities which works like Trace ability and thus we wont need to carry Trace poke too and obviously this would be cheaper like 10c or 15c item.
Hope this would be helpful.