For me, it goes in a list, ranging from the top as the hardest and the bottom as the easiest.
-Pulse Tangrowth #1. (I didn't know much about the type at that time.)
-Pulse Tangrowth #2. (And I still didn't figure out it's type at that time, deez Chatot.)
-Pulse Muk. (This one took a lucky Magnitude 10 from Golem on the first try, if it didn't happen, then I might be struggling.)
-Pulse Swalot. (This is somehow easier, as Steel nullifies type scaling damage from the field, so keep set up and beat it up.)
-Pulse Abra. (Hyper Beam bait, alright.)
-Pulse Avalugg. (By far the easiest, you know how to deal with this.)