Odionte

A guy offers me a mount and an average dratini for my Weepinbell, but I am not sure if it is a good offer. I'm new in this game but I've played pokemon before, for now I have 3 medals and I'm about to get the fourth and so be able to trade. I've been reading about movesets, natures and uses for Victreebel and now I know my weepinbell could worth more than the guy is offering for it, could be a good Sunny Sweeper in the future. Could you tell me how much could it be worth like this now? and, How much could it be worth at level 100 and with its well-trained stats and a good moveset? Thank you very much in advance! PD: Sorry if make writing mistakes, english is not my firs lenguage.