For Cedric Juniper, can the opponent look at any face up cards around them to figure out the height of a Pokemon. Can he/she look at an open binder nearby?
You could look at other Pokemon that are in play but not at a binder. Just on the field, in your hand, or in the Discard Pile for either player.
Source: TPCi Rules Team (2013-11-21)
When using Cedric Juniper, my opponent asks for the height of a Pokemon in play on the field. Is it legal for him to cover that card up?
Nope.
Source: TPCi Rules Team (2013-11-21)