Tiles and Text

Ok I decided to scratch my old game and create one with tiles.
What would be the best way to have a text bubble pop up when I hit the king on the throne tile? Would the code be within the tile mc or the stage? Im not really sure where to go.

EDIT// In case it wasnt clear i want a text bubble to pop up when the avatar hits the king on the throne tile. This text bubble would be advanced using a key until text is played through.

Ill attach my file and feel free to leave suggestions on anything else while your at it.