What is the lowest possible accuracy percentage for a Pokemon move and under what circumstances?

Question

Replaying Platinum these days and this just came up.

Let's say the user uses DynamicPunch or Zap Cannon, is at -6 accuracy and the enemy is at +6 evasion and fighting in the Sinnoh fog for example. What is the lowest possible accuracy percentage that an attacking move could have in this situation?

Also, what are some other situations like this one with bad accuracy percentages?

Comments

There are a few things that modify a move's chance to hit without using stages, like bright powder, hustle, sand veil, and wonder skin.