The ornamental design for an outdoorinflatableballoon with balloon display holder and flexible mounting pole, as shown and described.
FIG. 1 is a front view of the outdoor inflatable balloon with balloon display holder and flexible mounting pole. The rear view, side view and opposite side view are identical to the front view, as shown in this drawing;
FIG. 2 is a bottom view thereof and illustration my new design;
FIG. 3 is a top view thereof and illustrating my new design; and,
FIG. 4 is a perspective view of the outdoor inflatable balloon with balloon display holder and flexible mounting pole attached to a rear window of a vehicle. The broken lines showing the rear window of the vehicle and portion of the vehicle in FIG. 4 are for illustrative purposes only and form no part of the claimed design.