Guidelines/Tips for Lion Zoro and Vivi + When does monster chopper release?

1. When does monster chopper drop?

AND

2. What are the basic guidelines for using Liong Song Zoro + Vivi? Any helpful tips?
I asked some people on the blog and they said I can run with Wolf Zoro and still be fine for MC.

1) Monster chopper has a 50% drop rate at 30 stamina and 100% at 40 stamina just like mihawk.
2)Yes you can run wolf Zoro because of the same Captain ability. The only guidelines for monster chopper with a zoro/vivi team are:
Use wolf zoro/lion song
Vivi must be over level 73+
Use diable jambe sanjis special for the fourth stage (otherwise they will lock you)
Bring your hardest quick hitters for clearing him faster (1.8m hp will take time)

Have fun.