I'm breeding a defensive based Scolipede for baton pass abuse to special defense walls and I am having trouble deciding on what nature I want him.

My goal is to abuse his speed boost and set up with iron defense then baton pass to Florges or M.Gardevoir w/ calm mind + wish and set up with them and prepare for a sweep. This could work well with any sweeper, really. Scolipede can also do sword dance as well.

Should I do jolly for initiative in the off chance I get out-speed on my first iron defense? Or should I get calm to boost his pitiful sp.def? Or better yet, are there any other pokemon that can perform this role better?