A Little Help With Spooky Cup Teambuilding?

[ScottyThunder]

The title is basically it. Usual when I do these kinds of competitions I can get a team together just fine, but most of the mons allowed I've never even touched before! If anyone could tell me where to start, or what some of the "best" mons out of the list are so I can figure out what I'll need to counter/check, that'd be awesome. Thanks in advance!