Usually moving save between (U) and (E) region works pretty fine without problems, some problems may occur if You move (J) save to (U) or (E) because of Japan characteristic characters unless You didn't used them
HOWEVER
Games like Pokemon which are supposed to communicate with any region will have such font installed and the worst case You can get is like mine where Your Gastly is still named ゴース (Ghos) instead of changing to Gastly