From Bulbapedia:
"Spiritomb is based on a Jibakurei, a spirit bound to a single place. It also based on a Buddhist tradition performed on New Year's Eve in Japan. A bell is rung 108 times to chase away the 108 temptations in order to achieve nirvana. Note also that Spiritomb is #108 in the Sinnoh Dex and also weighs 108.0kg, and that both its Defense and Special Defense base stats are 108."