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Except that it requires several turns for set up and one of the moves deals 50% at once to you to do 25% each turn to the enemy who can just switch out. That form of stalling is not very useful as your curse user will likely die very quickly.
How about rest as an option without chesto berry or sleep talk? as it isn't 2hko'd by much it could switch in to soak up hits while sleeping to wear off a turn or two of sleep and this gives it reliable recovery.
It isn't just that one move though. It also acts as a check to Azumarill and Togekiss. If you use Galvantula purely to spin web then die you're wasting a team slot.
I think there should be some more information about good team mates. The only support for Excadrill that was mentioned was smooth rock Tyranitar and Hippowdon. What are good options for removing Excadrill's checks and counters? What has type synergy for easier switches?
Looking for a spitback charmander preferably female.
I can offer:
Drilbur adamant m 31/31/x/x/31/31 mold breaker
Drilbur adamant f 31/31/31/x/31/x mold breaker
Or any y exclusive mega stones barring charizardite y or mewtwo y