Too Funk to Druck
I am America
I think it's unfair because the creators obviously made Shedinja thinking that the opposing trainer would have several Pokemon in their team with the probability that one or two of those attack was Super Effective against Shedinja. But having only 1 Pokemon on your team reduces those odds A LOT, so it's comparatively unfair.
I think a lot of idiots are posting here not realizing that you were at the Battle Hall with ONE Pokemon on your team only.
I realized it, but the whole point of the Battle Hall is to be prepared for everything except for the few legendaries that are banned. Since Shedinja isn't banned, you obviously need to be prepared for it when you choose bug or ghost, and if you're not, then you have no one to blame but yourself.