Oh yes- the fastest way to find yourself in that sort of trouble is taking a Yamask's mask and placing it on yourself. Some found that out the hard way. An angry Ghost Type is capable of... quite a bit. [Even those just playing pranks could be dangerous, depending on their sense of 'fun' of course but—

Clavell tipped his head, a little in thought, as a hand rose to adjust his glasses just in some small idle motion.]

A majority enjoy berries and even plants. Totodile here would much prefer freshwater fish, insects, and even the occasional mammal; meat, in other words. They can also enjoy food suitable for human consumption, and a number of trainers do share their own meals with their pokémon. Some have quiet the sweet-tooth that can be kept in mind for a nice treat. Keep in mind not to overfeed, of course.