Jolly is good if you want to run a Sash/Dragon Dance set, where Crawdaunt takes more a of a sweeper initiative. However, most variants of Crawdaunt are in fact wallbreakers, whose primary function is to slap down the opponent's bulky Pokemon, and tear holes in their defenses.
One good thing about Jolly Crawdaunts though; you get to jump Pokemon upto 90 base speed uninvested Pokemon. This includes all Rotom formes, Excadrill, Landorus - T (which don't invest, i.e the bulkier variants).
Here's a set for Jolly Crawdaunt anyways:
Crawdaunt @ Focus Sash
EVs: 252 Atk / 252 Spe / 4 Def
- Swords Dance
- Aqua Jet
- Knock Off
Hope I helped!