Just can't see the long term appeal of this when the rotation of pokemons are so low. Once you've found the pidgeys, rats and the common gen 2 then you could go for days / weeks without seeing anything that you wanted. Why don't they shift it more so pidgeys get replaced by Diglett for example.
I do still like the events and I was throwing pineapples galore to try and get a gyrados during the water event. I'm guessing there will be an easter event (eggs??) but I doubt I'll do much before then.