why not use the ghost water pokemon? it can spin block and burn or toxic it also has water absorb and has acess to recover for stall
The problem with the Gellicent, who is an awesome pokemon anyways... is that using Gellicent over something like a ScarfGengar or a BandedTomb adds ANOTHER water type to your list. Generally, you want to keep your water typing to a minimum so that you aren't heavily grass weak or electric weak. You CAN run Gellicent... just make sure you only have 2 more water types... And having to run Tentacruel limits you down to one...