Ghastly - Everything You Need in a Ghost, and Then Some. 
Ghastly just does... a lot.
- Multiple forms of status
- Spinblocks
- Can set rain or sun
- Hits hard and fast
- Can make the lives of several top-tier mons so, so much harder with Haze and Taunt
- Furret? Swalot? Lickitung? Never heard of them. They stopped existing on the field
- Explode or Destiny Bond in a pinch
- Files and optimizes your taxes
...seriously, short of some major 4-moveslot-syndrome and the defenses of a wet paper bag, this thing is completely stacked. It isn't a beast, it isn't a monster, but it's a ghoul, and that's good enough for it to play a crucial role on some of the more offensive teams in this tier. Pair it with spikes of your own, and run wild.
Want me to highlight a specific PU mon? Just lmk what mon and why it's the most adorable little war crime this side of Hoenn. I can be found on discord, on smogon, and other places, so don't hesitate to reach out! There's also the
PU Discord Server if you want to lurk in #oldgens and stay up-to-date on all things PU