>>18590101there are really situational uses for Hyper Beam on most of the Pokemon in the OP's picture.
Hyper Beam maims Dragons for Heliolisk, something it can't do without resorting to Focus Blast/Dark Pulse. Some Dragons resist those, and Dark Pulse isn't very strong on a neutral hit. If Heliolisk is facing down, say, Garchomp, and switching out is a bad option, Hyper Beam would do a huge chunk of damage before you lose Heliolisk.
That's just one example. Obviously it's not a good choice for an attack a lot of the time.