Are you asking if Empoleon is slow, and would work well in Trick Room?
Well, Empoleon is an incredibly good choice! Especially with Quiet Nature.
Empoleon has a Speed stat of 60, which is pretty low, and with the Quiet Nature, it decreases the Speed even more, taking it to 54.
Heck yeah, Empoleon is a great choice. But unless you use the GTS, I don't think you can get a Piplup though, so good luck with that.