My friend Marc & went to find the Pikachu Nest areas around Block 497 Jurong West Street 41 recommended by friend MaryRachel Yee in Pokemon 

Here’s Marc’s youtube channel on Bukit Batok Nature Park https://www.youtube.com/watch?v=va-AMpM6JAc&feature=youtu.be

Oh, yes we did find some Pikachu there within 2 hours of exploring we get at least 3 Pikachu and we manage to get another 2 more the next day.

The spawn rate is pretty slow but at least Pikachu do spawn here.