How Good is Sableye?

I’ve had a Sableye on my team for a while now and its pretty good, its kinda frail but its really strong. Will it be good throughout the rest of the game? I would hate to drop it now.

Depends on set and Nature and IVs and EVs.

Mega Sableye is great, but you need to use tesseract in the Helios sewers to get it, but tesseract is recieved before the sixth gym, so if you are not close, you might want to temporarily box him until then