If anyone is still looking for omanytes, try to check out dataran PJ. I suspect its a nest.

Maybe Omanytes slept early...  

Noted. But from the comments I've been following, the spawn rate is very low, sometimes 40min to 1 hr for 1 fella to pop out. Far cry from the spawn rate at kelana jaya previously. Timing also affects. Some ppl said seel at laman seri spawn quite regularly. Was there on Sunday evening but only got 2 for ard 40 min. So it also depends on day n time, if lucky you get more. Only advice is try again at diff time to see how the spawn is like. Other forumers also managed to omanyte at dataran PJ, maybe can seek their advice on time. Personally I won't go there to farm now coz I only have 1 good omanyte and enough candy to evolve.