Just like Flower said, there's a level script in the map, so just delete it from Advance Map's Header View. Though there are two level scripts in Lilycove, so just delete the second one, which is a "setmaptile" script.
I'd also like to ask you, if you have any simple question such as this one that you think can be answered in one or two replies, use the Quick Questions and Answers thread instead of making a new thread on it. n_n
A Pokemon that is discriminated!
Support squirtle and make it everyone's favourite.