After defeating the Feraligatr, look for the following CP values. These values are those of a Feraligatr with perfect IV's.
Feraligatr has 205 attack, 197 defense, and 170 stamina. As a Raid Boss, it has a CP of 27740.
Feraligatr is a Water-type. It has access to the following moves:
IMAGE CREDIT: The Pokémon Company