Jellicent

Jellicent has been hyped largely for PvP, not so much for the PvE side. Poor offensive stats results in little use for raids or attacking gyms. Its defensive typing however, makes it quite useful for gym defense thanks to its 8 resistances. 

Best PvE Offensive Moveset

• Bubble is the stronger fast move, but Jellicent doesn't have adequate Water-type charge moves to pair with. 
• Hex shares the same typing with Shadow Ball to fulfill a Ghost-type role. 
• Surf is the Charged Move of choice for Jellicent
• Bubble Beam isn't a particularly strong move.
• Ice Beam doesn't have any offensive use. 

Best PvE Defensive Moveset

• Hex is generally better on defense as it's largely unresisted. 
• Bubble has slightly stronger defensive damage output, but is resisted by Grass and Dragon-type attackers.
• Bubble Beam can be used as a 3-bar move very frequently, but its damage output isn't very strong.
• Surf has more power than Bubble, but it comes out less frequently. All-in-all, it's fairly comparable to Bubble Beam.
• Ice Beam is the hardest to dodge, and threatens Grass and Dragon-type attackers.
• Shadow Ball is the strongest charge move option, but is also the easiest to dodge. 

Both fast moves are similar in performance; Bubble offers slightly stronger Water-type coverage, while Hex sports slightly faster energy gains with Ghost-type coverage. Either moveset can be viable.

Surf is Jellicent's cheapest Charged Attack and has solid DPE, allowing Jellicent to deal consistent Water-type damage. Shadow Ball benefits from STAB to deal significant damage, which is largely unresisted against most of the meta. Ice Beam offers useful coverage, including against Jellicent's weakness to Grass-types, but its damage output is less impressive. Bubble Beam can be used to debuff opponents, but it is generally too weak.