>>27351847Used Hypno in my nuzlocke, it gets Confusion early but that's the only Psychic STAB it'll get for a long time, learns Psychic at Lv 49. However, it can learn all of the elemental punches that can be bought in Goldenrod, so that alone make him capable of customizing his moveset to take care of whatever it wants. Hypnosis, despite the miss chance, is also completely dope, even without Dream Eater.
Can't really speak much about it in HGSS, but it gets Psybeam at Lv 28 and Psychic at Lv 40 so that should help tremendously, and while the punches are now egg moves only, you can still teach it Focus Blast from the Goldenrod department, and if you want to give it the Shadow Ball TM as well then that should net you all the moves you need to round off the coverage.
It doesn't hit too hard after the special split, which is a shame, although it has enough speed to outpace most in-game opponents, and those it doesn't will rarely be able to KO it quickly. So Hypno may not be a great pick, but it's far from worthless and should definitely be considered.