From BR Bullpen

A crosschecker is a type of scout whose main function is to provide a second opinion on the reports filed by primarily-level scouts on players. Crosscheckers can be assigned a regional territory, or work at the national level. Typically, crosscheckers will concentrate on seeing potential early-round prospects for the amateur draft or players which may be targeted in a trade, to ensure that reports an organization has on them match their own evaluation.