I took me a while to hatch my first Gen 3 babies, aka Azurill and Wynaut. But after quite a few hatches of each of them, I feel they are just useless and taking too much precious space in the bag. So is it worth to keep them for maybe some trading purpose or should I just trash them to Professor?
Useless in baby form.
Usable at their last evolutions as defenders but nothing that would surpass a Steelix or a Cleffable.
So keep only if you like to have a diversity of options for gym defending other than the mandatory Blisslaxchaking. Otherwise, just grind them. I mean, transfer them. Personally, I wouldn't trade anything for a baby I didn't have because they are sure to hatch AT SOME POINT. At most keep one if decent IVs just in case...
Wobbuffet is actually pretty great for a few things and I'd definitely rate it higher than Steelix and maybe Clefable as a defender. Besides Chansey, it has the greatest ratio of bulk to CP, which makes it good for holding gyms overnight and still providing a speedbump for an opponent. This also puts it to top3 of defenders that are the best at wasting the attacker's time. Wobbuffet gives so little badge XP due to its low CP that it's on the level of Chansey and Blissey in how little return the attacker gets for their time investment.
And it resists Machamp so you can put it between normal types.
