You can get these peoples phone no' to find rare pokemon:

Fisherman Ralph - rte 32 - Qwilfsh
Hiker Anthony - rte 33 - Dunsparce
Bugcatcher Arnie - rte 35 - Yanma
Schoolboy Chad - rte 38 - Snubbull
Fisherman Wilton - rte 44 - Remoraid
Hiker Parry - rte 45 - Marill