What tool do I need to remove this bottom bracket? Would I need a three-notched tool to remove this?
Three-hooked spanner is not necessary, but it would improve the engagement and decrease chance of stripping a notch on the BB lockring. Parktool makes the  HCW-5 spanner, which combines both a three-hook and a single hook. Here's a relevant quote:


  One side is a single hook, the other is a hook spanner with 3 notches
  for better engagement in the lockrings.