It's hard to me get explained well... sorry. :Angry:
Google Translator:
Unlike missions that ask the npc's, in this case, the work is not a request to perform a specific action, but to make a specific job which gives you a profit as long as the work force. For example, as you said "emonission" can be an advantage that through the work while it is successfully performed. That may increase, somehow, the "market" pokémon. There may be, for example, pharmacists can create Iron, PP Up and so things change berries, for example, and this gives them a benefit one way or another (obviously, I say this in a random manner, as I do not want to ask something that causes an imbalance in the game).
The difference between the missions and work completely would be something similar to what a MMORPG either: in a MMORPG might well ask a mission NPC (it is most common), but also work, for example, fisherman, farmer, lumberjack and so on ... so that this is one of the only ways to get a specific object in the game and, say, take the chance that something will "collect" with effort. In the case of Pokemaniacs money each you exit X pokemon and features or have, a fisherman would collect would be something like (it is open to the imagination in this case in order not to encourage the unequal or unbalanced topic)
Sorry this was written by the Google Translator.