Maju bus number 96 runs every 15 minutes (peak period) to 30 minutes (off-peak period) from 6.30am to 10pm from Johore Bahru's Larkin Bus & Taxi Terminal to Pontian Kecil. Causeway Link provides direct bus services between Singapore's Jurong East MRT station and Pontian Kecil via Gelang Patah, using the Malaysia–Singapore Second Link. The frequency from Pontian Kecil to Singapore is 6 direct buses a day and only 4 in the reverse direction.
Pontian Express Bus Terminal - Google Maps