Since Swellow is in its GP stage, I would like to reserve Jynx.
I think Jynx is deserving of an analysis because it has very nice coverage in Ice Beam, Psyshock, and Focus Blast while also sporting some other attacking options like Energy Ball, Hyper Voice, Shadow Ball, Draining Kiss, and Hidden Power Fire. It has access to Lovely Kiss to make the opposing Pokemon fall asleep and it has the same accuracy as Sleep Powder. After making the opposing Pokemon fall asleep, it can set up with Nasty Plot or just straight up attack the opposing Pokemon. It has other options as well, such as Taunt and Substitute. It has very nice offensive stats with base 115 Special Attack and 95 Speed. It also has the ability Dry Skin, which can easily give it a free switch in against bulky Water-types. Jynx can also use a Choice Scarf set to fire off fast attacks. Of course, it has its flaws. It has a crippling Stealth Rock weakness and it's vulnerable to every form of entry hazard. It's also incredibly frail with 65 / 35 / 95 bulk, so it's easily revenge killed by faster threats or by priority such as Mach Punch.