The Pok&eacute;mon is immune to <a href="http://pldh.net/dex/type/ground" class="linksred">Ground type</a> attacks. The balloon will pop when hit by any other attack that does not deal indirect damage. It works as though the Pok&eacute;mon was part <a href="http://pldh.net/dex/type/flying" class="linksred">Flying type</a>.